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    A time zone is associated with a time zone offset. A time zone offset is the displacement of the time zone measured in hours from the UTC origin point.

    In addition, local time is optionally affected by daylight saving time, which adds or subtracts a time interval adjustment. Local time is calculated by adding the time zone offset to UTC and adjusting for daylight saving time if necessary.

    The time zone offset at the UTC origin point is zero. UTC time is suitable for calculations, comparisons, and storing dates and time in files.

    Local time is appropriate for display in user interfaces of desktop applications. Time zone-aware applications such as many Web applications also need to work with a number of other time zones.

    Unspecified , it is unspecified whether the time represented is local time, UTC time, or a time in some other time zone.

    As an alternative to performing date and time arithmetic on DateTime values to measure elapsed time, you can use the Stopwatch class.

    The Ticks property expresses date and time values in units of one ten-millionth of a second. The Millisecond property returns the thousandths of a second in a date and time value.

    Using repeated calls to the DateTime. Now property to measure elapsed time is dependent on the system clock.

    The system clock on Windows 7 and Windows 8 systems has a resolution of approximately 15 milliseconds. This resolution affects small time intervals less than milliseconds.

    The following example illustrates the dependence of current date and time values on the resolution of the system clock. In the example, an outer loop repeats 20 times, and an inner loop serves to delay the outer loop.

    If the value of the outer loop counter is 10, a call to the Thread. Sleep method introduces a five-millisecond delay.

    The following example shows the number of milliseconds returned by the DateTime. Milliseconds property changes only after the call to Thread.

    A calculation using a DateTime structure, such as Add or Subtract , does not modify the value of the structure. Instead, the calculation returns a new DateTime structure whose value is the result of the calculation.

    Conversion operations between time zones such as between UTC and local time, or between one time zone and another take daylight saving time into account, but arithmetic and comparison operations do not.

    The DateTime structure itself offers limited support for converting from one time zone to another. However, a full set of time zone conversion methods is available in the TimeZoneInfo class.

    You convert the time in any one of the world's time zones to the time in any other time zone using these methods. Calculations and comparisons of DateTime objects are meaningful only if the objects represent times in the same time zone.

    You can use a TimeZoneInfo object to represent a DateTime value's time zone, although the two are loosely coupled.

    A DateTime object does not have a property that returns an object that represents that date and time value's time zone.

    In a time zone-aware application, you must rely on some external mechanism to determine the time zone in which a DateTime object was created.

    You could use a structure that wraps both the DateTime value and the TimeZoneInfo object that represents the DateTime value's time zone.

    Each DateTime member implicitly uses the Gregorian calendar to perform its operation. Exceptions are methods that implicitly specify a calendar.

    These include constructors that specify a calendar, and methods with a parameter derived from IFormatProvider , such as System. Operations by members of the DateTime type take into account details such as leap years and the number of days in a month.

    Each culture uses a default calendar defined by its read-only CultureInfo. Each culture may support one or more calendars defined by its read-only CultureInfo.

    It must be one of the calendars found in the CultureInfo. A culture's current calendar is used in all formatting operations for that culture.

    For example, the default calendar of the Thai Buddhist culture is the Thai Buddhist Era calendar, which is represented by the ThaiBuddhistCalendar class.

    When a CultureInfo object that represents the Thai Buddhist culture is used in a date and time formatting operation, the Thai Buddhist Era calendar is used by default.

    Calendar property is changed, as the following example shows:. A culture's current calendar is also used in all parsing operations for that culture, as the following example shows.

    You instantiate a DateTime value using the date and time elements number of the year, month, and day of a specific calendar by calling a DateTime constructor that includes a calendar parameter and passing it a Calendar object that represents that calendar.

    The following example uses the date and time elements from the ThaiBuddhistCalendar calendar. DateTime constructors that do not include a calendar parameter assume that the date and time elements are expressed as units in the Gregorian calendar.

    All other DateTime properties and methods use the Gregorian calendar. For example, the DateTime. Year property returns the year in the Gregorian calendar, and the DateTime.

    IsLeapYear Int32 method assumes that the year parameter is a year in the Gregorian calendar. Each DateTime member that uses the Gregorian calendar has a corresponding member of the Calendar class that uses a specific calendar.

    For example, the Calendar. GetYear method returns the year in a specific calendar, and the Calendar. IsLeapYear method interprets the year parameter as a year number in a specific calendar.

    The following example uses both the DateTime and the corresponding members of the ThaiBuddhistCalendar class. It does not include a member that allows you to retrieve the week number of the year.

    To retrieve the week of the year, call the individual calendar's Calendar. The following example provides an illustration. For more information on dates and calendars, see Working with Calendars.

    You can persist DateTime values in four ways:. You must ensure that the routine that restores the DateTime values doesn't lose data or throw an exception regardless of which technique you choose.

    DateTime values should round-trip. That is, the original value and the restored value should be the same. And if the original DateTime value represents a single instant of time, it should identify the same moment of time when it's restored.

    To successfully restore DateTime values that are persisted as strings, follow these rules:. Make the same assumptions about culture-specific formatting when you restore the string as when you persisted it.

    To ensure that a string can be restored on a system whose current culture is different from the culture of the system it was saved on, call the ToString overload to save the string by using the conventions of the invariant culture.

    If the date represents a single moment of time, ensure that it represents the same moment in time when it's restored, even on a different time zone.

    You can also serialize the value along with time zone information. For more information about this approach, see Serializing DateTime and time zone data.

    The most common error made when persisting DateTime values as strings is to rely on the formatting conventions of the default or current culture.

    Problems arise if the current culture is different when saving and restoring the strings. The following example illustrates these problems.

    It saves five dates using the formatting conventions of the current culture, which in this case is English United States. It restores the dates using the formatting conventions of a different culture, which in this case is English Great Britain.

    Because the formatting conventions of the two cultures are different, two of the dates can't be restored, and the remaining three dates are interpreted incorrectly.

    Also, if the original date and time values represent single moments in time, the restored times are incorrect because time zone information is lost.

    To round-trip DateTime values successfully, follow these steps:. To restore the persisted DateTime values without data loss, follow these steps:.

    The following example uses the invariant culture and the "O" standard format string to ensure that DateTime values saved and restored represent the same moment in time regardless of the system, culture, or time zone of the source and target systems.

    You can persist a date and time as an Int64 value that represents a number of ticks. In this case, you don't have to consider the culture of the systems the DateTime values are persisted and restored on.

    To persist a DateTime value as an integer:. To restore a DateTime value that has been persisted as an integer:. The following example persists an array of DateTime values as integers on a system in the U.

    It restores it on a system in the UTC zone. The file that contains the integers includes an Int32 value that indicates the total number of Int64 values that immediately follow it.

    You can persist DateTime values through serialization to a stream or file, and then restore them through deserialization.

    DateTime data is serialized in some specified object format. The objects are restored when they are deserialized. A formatter or serializer, such as XmlSerializer or BinaryFormatter , handles the process of serialization and deserialization.

    For more information about serialization and the types of serialization supported by the. NET Framework, see Serialization. The following example uses the XmlSerializer class to serialize and deserialize DateTime values.

    The values represent all leap year days in the twenty-first century. The output represents the result if the example is run on a system whose current culture is English Great Britain.

    Because you've deserialized the DateTime object itself, the code doesn't have to handle cultural differences in date and time formats.

    The previous example doesn't include time information. If a DateTime value represents a moment in time and is expressed as a local time, convert it from local time to UTC before serializing it by calling the ToUniversalTime method.

    The following example uses the BinaryFormatter class to serialize DateTime data on a system in the U. Pacific Standard Time zone and to deserialize it on a system in the U.

    The previous examples all assumed that DateTime values are expressed as local times. The code converted the values between UTC and local time so they reflect the same moment in time on the source and target systems.

    DateTime values may also reflect moments in time in a time zone other than local and UTC. Because the DateTime structure is not time zone-aware, you have to serialize both the DateTime value and the TimeZoneInfo object that represents its time zone.

    Create a type whose fields include both the DateTime value and its time zone. The following example defines a DateWithTimeZone structure.

    By using the DateWithTimeZone structure, you can then persist date and time along with time zone information. The following example then calls the BinaryFormatter.

    Deserialize method to deserialize it. You can subtract one instance of DateTime from another to obtain a TimeSpan object that represents the time interval between them.

    Or you could add a positive TimeSpan to the current DateTime to obtain a DateTime value that represents a future date.

    You can add or subtract a time interval from a DateTime object. Time intervals can be negative or positive, and they can be expressed in units such as ticks, seconds, or as a TimeSpan object.

    Equality comparisons for DateTime values are exact. That means two values must be expressed as the same number of ticks to be considered equal.

    That precision is often unecessary or even incorrect for many applications. Often, you want to test if DateTime objects are roughly equal. The following example demonstrates how to compare roughly equivalent DateTime.

    It accepts a small margin of difference when declaring them equal. A DateTime value that is transferred to a COM application, then is transferred back to a managed application, is said to round-trip.

    However, a DateTime value that specifies only a time does not round-trip as you might expect. If you round-trip only a time, such as 3 P. When only a time is passed from the.

    When only a time is passed from COM to the. NET Framework, no special processing is performed because that would corrupt legitimate dates and times on or before December 30, If a date starts its round-trip from COM, the.

    The behavior of the. NET Framework and COM means that if your application round-trips a DateTime that only specifies a time, your application must remember to modify or ignore the erroneous date from the final DateTime object.

    Initializes a new instance of the DateTime structure to a specified number of ticks. Initializes a new instance of the DateTime structure to the specified year, month, and day.

    Initializes a new instance of the DateTime structure to the specified year, month, and day for the specified calendar.

    Initializes a new instance of the DateTime structure to the specified year, month, day, hour, minute, and second.

    Initializes a new instance of the DateTime structure to the specified year, month, day, hour, minute, second, and Coordinated Universal Time UTC or local time.

    Initializes a new instance of the DateTime structure to the specified year, month, day, hour, minute, and second for the specified calendar.

    Initializes a new instance of the DateTime structure to the specified year, month, day, hour, minute, second, and millisecond.

    Initializes a new instance of the DateTime structure to the specified year, month, day, hour, minute, second, millisecond, and Coordinated Universal Time UTC or local time.

    Initializes a new instance of the DateTime structure to the specified year, month, day, hour, minute, second, and millisecond for the specified calendar.

    Initializes a new instance of the DateTime structure to the specified year, month, day, hour, minute, second, millisecond, and Coordinated Universal Time UTC or local time for the specified calendar.

    Represents the largest possible value of DateTime. This field is read-only. Represents the smallest possible value of DateTime.

    Gets a value that indicates whether the time represented by this instance is based on local time, Coordinated Universal Time UTC , or neither.

    Gets a DateTime object that is set to the current date and time on this computer, expressed as the local time. Returns a new DateTime that adds the value of the specified TimeSpan to the value of this instance.

    Returns a new DateTime that adds the specified number of days to the value of this instance. Returns a new DateTime that adds the specified number of hours to the value of this instance.

    Returns a new DateTime that adds the specified number of milliseconds to the value of this instance. Returns a new DateTime that adds the specified number of minutes to the value of this instance.

    Returns a new DateTime that adds the specified number of months to the value of this instance. Returns a new DateTime that adds the specified number of seconds to the value of this instance.

    Returns a new DateTime that adds the specified number of ticks to the value of this instance. Returns a new DateTime that adds the specified number of years to the value of this instance.

    Compares two instances of DateTime and returns an integer that indicates whether the first instance is earlier than, the same as, or later than the second instance.

    Compares the value of this instance to a specified DateTime value and returns an integer that indicates whether this instance is earlier than, the same as, or later than the specified DateTime value.

    Compares the value of this instance to a specified object that contains a specified DateTime value, and returns an integer that indicates whether this instance is earlier than, the same as, or later than the specified DateTime value.

    If you have a problem with the different time zone, this is the solution for that. Working almost identical to date function only as a supplement has the time zone option.

    For Microseconds, we can get by following: This is very good for SEO especially search engines like Google.

    Prior to PHP 5. Today is Sun 2 Oct , day 0 of this week. Day 1 of next week is 10 Oct Today is Sun 2 Oct , day 7 of this week.

    Day 1 of next week is 03 Oct Today is Sun 2 Oct , day 7 of this week. Day 1 of next week is 03 Oct If timestamp is a string, date converts it to an integer in a possibly unexpected way: Monday-Friday, excluding holidays between any two given dates.

    I couldn't find a simple way to do that in PHP, so I threw this together. I've tested it pretty strenuously but date arithmetic is complicated and there's always the possibility I missed something, so please feel free to check my math.

    The function could certainly be made much more powerful, to allow you to set different days to be ignored e. But that's a project for another time.

    For each holiday between the start and end dates that isn't a Saturday or a Sunday, remove one day. At least in PHP 5. Y', gives a result of 2.

    So date is not longer limited to the minimum and maximum values for a bit signed integer as timestamp. I've been flicking through the comments looking for some succinct date code and have noticed an alarming number of questions and over-burdened examples related to date mathematics.

    One of the most useful skills you can utilize when performing date math is taking full advantage of the UNIX timestamp.

    The UNIX timestamp was built for this kind of work. An example of this relates to a comment made by james at bandit-dot-co-dot-en-zed. James was looking for a way to calculate the number of days which have passed since a certain date.

    Rather than using mktime and a loop, James can subtract the current timestamp from the timestamp of the date in question and divide that by the number of seconds in a day: Rather than the looping and fine tuning of a date, Kyle can use the raw UNIX timestamps this is untested code: Here's my solution for looking up the month number by name used when parsing an 'ls': If you are having an issue getting u to work so is everyone else.

    The solution that I am using which I found on another site so not taking credit is to use this: The following function will return the date on the Gregorian calendar for Orthodox Easter Pascha.

    Note that incorrect results will be returned for years less than or greater than This is because the Julian calendar from which the Easter date is calculated deviates from the Gregorian by one day for each century-year that is NOT a leap-year, i.

    Its complexity derives from the fact that the calculation is based on a combination of solar and lunar calendars. Note that some formatting options are different from MySQL.

    In order to determine if a year is a leap year an earlier poster suggested simply checking to see if the year is a multiple of four: A function not using php's date function that will also account for this small anomaly in leap years: To quickly convert date "N" to a 0 based index with Sunday being represented as 0, you can run it against modulus 7: If looking for a simple way to return the week number, using Sunday as the first day of the week, please bear in mind you will need to cater for the addition when you reach the end of the year.

    In order to define leap year you must considre not only that year can be divide by 4! The correct alghoritm is: If you see the number in a date calculation, think very hard before deciding that it is correct.

    Not all days have 86, seconds in them. In many places, some days have only 82, seconds and some have 90, Occasionally, there are even fewer or even more.

    Assuming that now plus 86, seconds is equivalent to some time tomorrow can sometimes be wrong. It might actually be the day after tomorrow or still today.

    It's called Daylight Saving. This might be useful for someone.

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    Other applications may require different string representations of a date. ToString String method returns the string representation defined by a standard or custom format specifier using the formatting conventions of the current culture.

    ToString String method to display the full date and time pattern for the en-US culture, the current culture on the computer on which the example was run.

    Finally, you can specify both the culture and the format using the DateTime. ToString String overload can also be used with a custom format string to specify other formats.

    The following example shows how to format a string using the ISO standard format often used for web services.

    The Iso format does not have a corresponding standard format string. Parsing converts the string representation of a date and time to a DateTime value.

    Typically, date and time strings have two different usages in applications:. A date and time takes a variety of forms and reflects the conventions of either the current culture or a specific culture.

    A date and time is represented in a predefined format. For example, an application serializes a date as "" independently of the culture on which the app is running.

    An application may require dates be input in the current culture's short date format. You use the Parse or TryParse method to convert a string from one of the common date and time formats used by a culture to a DateTime value.

    The following example shows how you can use TryParse to convert date strings in different culture-specific formats to a DateTime value.

    It changes the current culture to English Great Britain and calls the GetDateTimeFormats method to generate an array of date and time strings.

    It then passes each element in the array to the TryParse method. The output from the example shows the parsing method was able to successfully convert each of the culture-specific date and time strings.

    You use the ParseExact and TryParseExact methods to convert a string that must match a particular format or formats to a DateTime value.

    You specify one or more date and time format strings as a parameter to the parsing method. One common use for ParseExact is to convert a string representation from a web service, usually in ISO standard format.

    The following code shows the correct format string to use:. If a string cannot be parsed, the Parse and ParseExact methods throw an exception.

    The TryParse and TryParseExact methods return a Boolean value that indicates whether the conversion succeeded or failed.

    The parsing operation for date and time strings tends to have a high failure rate, and exception handling is expensive. Use these methods if strings are input by users or coming from an unknown source.

    For more information about parsing date and time values, see Parsing Date and Time Strings. Daylight saving time is not applicable to UTC.

    Local time is relative to a particular time zone. A time zone is associated with a time zone offset.

    A time zone offset is the displacement of the time zone measured in hours from the UTC origin point. In addition, local time is optionally affected by daylight saving time, which adds or subtracts a time interval adjustment.

    Local time is calculated by adding the time zone offset to UTC and adjusting for daylight saving time if necessary.

    The time zone offset at the UTC origin point is zero. UTC time is suitable for calculations, comparisons, and storing dates and time in files.

    Local time is appropriate for display in user interfaces of desktop applications. Time zone-aware applications such as many Web applications also need to work with a number of other time zones.

    Unspecified , it is unspecified whether the time represented is local time, UTC time, or a time in some other time zone. As an alternative to performing date and time arithmetic on DateTime values to measure elapsed time, you can use the Stopwatch class.

    The Ticks property expresses date and time values in units of one ten-millionth of a second. The Millisecond property returns the thousandths of a second in a date and time value.

    Using repeated calls to the DateTime. Now property to measure elapsed time is dependent on the system clock. The system clock on Windows 7 and Windows 8 systems has a resolution of approximately 15 milliseconds.

    This resolution affects small time intervals less than milliseconds. The following example illustrates the dependence of current date and time values on the resolution of the system clock.

    In the example, an outer loop repeats 20 times, and an inner loop serves to delay the outer loop. If the value of the outer loop counter is 10, a call to the Thread.

    Sleep method introduces a five-millisecond delay. The following example shows the number of milliseconds returned by the DateTime.

    Milliseconds property changes only after the call to Thread. A calculation using a DateTime structure, such as Add or Subtract , does not modify the value of the structure.

    Instead, the calculation returns a new DateTime structure whose value is the result of the calculation.

    Conversion operations between time zones such as between UTC and local time, or between one time zone and another take daylight saving time into account, but arithmetic and comparison operations do not.

    The DateTime structure itself offers limited support for converting from one time zone to another. However, a full set of time zone conversion methods is available in the TimeZoneInfo class.

    You convert the time in any one of the world's time zones to the time in any other time zone using these methods. Calculations and comparisons of DateTime objects are meaningful only if the objects represent times in the same time zone.

    You can use a TimeZoneInfo object to represent a DateTime value's time zone, although the two are loosely coupled. A DateTime object does not have a property that returns an object that represents that date and time value's time zone.

    In a time zone-aware application, you must rely on some external mechanism to determine the time zone in which a DateTime object was created.

    You could use a structure that wraps both the DateTime value and the TimeZoneInfo object that represents the DateTime value's time zone.

    Each DateTime member implicitly uses the Gregorian calendar to perform its operation. Exceptions are methods that implicitly specify a calendar.

    These include constructors that specify a calendar, and methods with a parameter derived from IFormatProvider , such as System.

    Operations by members of the DateTime type take into account details such as leap years and the number of days in a month. Each culture uses a default calendar defined by its read-only CultureInfo.

    Each culture may support one or more calendars defined by its read-only CultureInfo. It must be one of the calendars found in the CultureInfo.

    A culture's current calendar is used in all formatting operations for that culture. For example, the default calendar of the Thai Buddhist culture is the Thai Buddhist Era calendar, which is represented by the ThaiBuddhistCalendar class.

    When a CultureInfo object that represents the Thai Buddhist culture is used in a date and time formatting operation, the Thai Buddhist Era calendar is used by default.

    Calendar property is changed, as the following example shows:. A culture's current calendar is also used in all parsing operations for that culture, as the following example shows.

    You instantiate a DateTime value using the date and time elements number of the year, month, and day of a specific calendar by calling a DateTime constructor that includes a calendar parameter and passing it a Calendar object that represents that calendar.

    The following example uses the date and time elements from the ThaiBuddhistCalendar calendar. DateTime constructors that do not include a calendar parameter assume that the date and time elements are expressed as units in the Gregorian calendar.

    All other DateTime properties and methods use the Gregorian calendar. For example, the DateTime. Year property returns the year in the Gregorian calendar, and the DateTime.

    IsLeapYear Int32 method assumes that the year parameter is a year in the Gregorian calendar. Each DateTime member that uses the Gregorian calendar has a corresponding member of the Calendar class that uses a specific calendar.

    For example, the Calendar. GetYear method returns the year in a specific calendar, and the Calendar. IsLeapYear method interprets the year parameter as a year number in a specific calendar.

    The following example uses both the DateTime and the corresponding members of the ThaiBuddhistCalendar class. It does not include a member that allows you to retrieve the week number of the year.

    To retrieve the week of the year, call the individual calendar's Calendar. The following example provides an illustration. For more information on dates and calendars, see Working with Calendars.

    You can persist DateTime values in four ways:. You must ensure that the routine that restores the DateTime values doesn't lose data or throw an exception regardless of which technique you choose.

    DateTime values should round-trip. That is, the original value and the restored value should be the same. And if the original DateTime value represents a single instant of time, it should identify the same moment of time when it's restored.

    To successfully restore DateTime values that are persisted as strings, follow these rules:. Make the same assumptions about culture-specific formatting when you restore the string as when you persisted it.

    To ensure that a string can be restored on a system whose current culture is different from the culture of the system it was saved on, call the ToString overload to save the string by using the conventions of the invariant culture.

    If the date represents a single moment of time, ensure that it represents the same moment in time when it's restored, even on a different time zone.

    You can also serialize the value along with time zone information. For more information about this approach, see Serializing DateTime and time zone data.

    The most common error made when persisting DateTime values as strings is to rely on the formatting conventions of the default or current culture.

    Problems arise if the current culture is different when saving and restoring the strings. The following example illustrates these problems.

    It saves five dates using the formatting conventions of the current culture, which in this case is English United States. It restores the dates using the formatting conventions of a different culture, which in this case is English Great Britain.

    Because the formatting conventions of the two cultures are different, two of the dates can't be restored, and the remaining three dates are interpreted incorrectly.

    Also, if the original date and time values represent single moments in time, the restored times are incorrect because time zone information is lost.

    To round-trip DateTime values successfully, follow these steps:. To restore the persisted DateTime values without data loss, follow these steps:.

    The following example uses the invariant culture and the "O" standard format string to ensure that DateTime values saved and restored represent the same moment in time regardless of the system, culture, or time zone of the source and target systems.

    You can persist a date and time as an Int64 value that represents a number of ticks. In this case, you don't have to consider the culture of the systems the DateTime values are persisted and restored on.

    To persist a DateTime value as an integer:. To restore a DateTime value that has been persisted as an integer:. The following example persists an array of DateTime values as integers on a system in the U.

    It restores it on a system in the UTC zone. The file that contains the integers includes an Int32 value that indicates the total number of Int64 values that immediately follow it.

    You can persist DateTime values through serialization to a stream or file, and then restore them through deserialization. DateTime data is serialized in some specified object format.

    The objects are restored when they are deserialized. A formatter or serializer, such as XmlSerializer or BinaryFormatter , handles the process of serialization and deserialization.

    For more information about serialization and the types of serialization supported by the. NET Framework, see Serialization. The following example uses the XmlSerializer class to serialize and deserialize DateTime values.

    The values represent all leap year days in the twenty-first century. The output represents the result if the example is run on a system whose current culture is English Great Britain.

    Because you've deserialized the DateTime object itself, the code doesn't have to handle cultural differences in date and time formats.

    The previous example doesn't include time information. If a DateTime value represents a moment in time and is expressed as a local time, convert it from local time to UTC before serializing it by calling the ToUniversalTime method.

    The following example uses the BinaryFormatter class to serialize DateTime data on a system in the U. Pacific Standard Time zone and to deserialize it on a system in the U.

    The previous examples all assumed that DateTime values are expressed as local times. The code converted the values between UTC and local time so they reflect the same moment in time on the source and target systems.

    DateTime values may also reflect moments in time in a time zone other than local and UTC. Because the DateTime structure is not time zone-aware, you have to serialize both the DateTime value and the TimeZoneInfo object that represents its time zone.

    Create a type whose fields include both the DateTime value and its time zone. The following example defines a DateWithTimeZone structure.

    By using the DateWithTimeZone structure, you can then persist date and time along with time zone information. The following example then calls the BinaryFormatter.

    Deserialize method to deserialize it. You can subtract one instance of DateTime from another to obtain a TimeSpan object that represents the time interval between them.

    Or you could add a positive TimeSpan to the current DateTime to obtain a DateTime value that represents a future date.

    You can add or subtract a time interval from a DateTime object. Time intervals can be negative or positive, and they can be expressed in units such as ticks, seconds, or as a TimeSpan object.

    Equality comparisons for DateTime values are exact. That means two values must be expressed as the same number of ticks to be considered equal. That precision is often unecessary or even incorrect for many applications.

    Often, you want to test if DateTime objects are roughly equal. The following example demonstrates how to compare roughly equivalent DateTime.

    It accepts a small margin of difference when declaring them equal. A DateTime value that is transferred to a COM application, then is transferred back to a managed application, is said to round-trip.

    However, a DateTime value that specifies only a time does not round-trip as you might expect. If you round-trip only a time, such as 3 P.

    When only a time is passed from the. When only a time is passed from COM to the. NET Framework, no special processing is performed because that would corrupt legitimate dates and times on or before December 30, If a date starts its round-trip from COM, the.

    However, before PHP 5. Example 1 date examples. You can prevent a recognized character in the format string from being expanded by escaping it with a preceding backslash.

    If the character with a backslash is already a special sequence, you may need to also escape the backslash. Example 2 Escaping characters in date.

    It is possible to use date and mktime together to find dates in the future or the past. Example 3 date and mktime example.

    This can be more reliable than simply adding or subtracting the number of seconds in a day or month to a timestamp because of daylight saving time.

    Some examples of date formatting. Note that you should escape any other characters, as any which currently have a special meaning will produce undesirable results, and other characters may be assigned meaning in future PHP versions.

    Example 4 date Formatting. To format dates in other languages, you should use the setlocale and strftime functions instead of date.

    To generate a timestamp from a string representation of the date, you may be able to use strtotime. Edit Report a Bug. Parameters format The format of the outputted date string.

    Return Values Returns a formatted date string. Changelog Version Description 5. Things to be aware of when using week numbers with years.

    If you have a problem with the different time zone, this is the solution for that. Working almost identical to date function only as a supplement has the time zone option.

    For Microseconds, we can get by following: This is very good for SEO especially search engines like Google. Prior to PHP 5. Today is Sun 2 Oct , day 0 of this week.

    Day 1 of next week is 10 Oct Today is Sun 2 Oct , day 7 of this week. Day 1 of next week is 03 Oct Today is Sun 2 Oct , day 7 of this week.

    Day 1 of next week is 03 Oct If timestamp is a string, date converts it to an integer in a possibly unexpected way: Monday-Friday, excluding holidays between any two given dates.

    I couldn't find a simple way to do that in PHP, so I threw this together. I've tested it pretty strenuously but date arithmetic is complicated and there's always the possibility I missed something, so please feel free to check my math.

    The function could certainly be made much more powerful, to allow you to set different days to be ignored e.

    But that's a project for another time. For each holiday between the start and end dates that isn't a Saturday or a Sunday, remove one day.

    At least in PHP 5. Y', gives a result of 2. So date is not longer limited to the minimum and maximum values for a bit signed integer as timestamp.

    I've been flicking through the comments looking for some succinct date code and have noticed an alarming number of questions and over-burdened examples related to date mathematics.

    One of the most useful skills you can utilize when performing date math is taking full advantage of the UNIX timestamp.

    The UNIX timestamp was built for this kind of work. An example of this relates to a comment made by james at bandit-dot-co-dot-en-zed.

    James was looking for a way to calculate the number of days which have passed since a certain date. Rather than using mktime and a loop, James can subtract the current timestamp from the timestamp of the date in question and divide that by the number of seconds in a day: Rather than the looping and fine tuning of a date, Kyle can use the raw UNIX timestamps this is untested code: Here's my solution for looking up the month number by name used when parsing an 'ls': If you are having an issue getting u to work so is everyone else.

    The solution that I am using which I found on another site so not taking credit is to use this: The following function will return the date on the Gregorian calendar for Orthodox Easter Pascha.

    Alexander zwerev property returns the year Beste Spielothek in Pötenitz finden the Gregorian calendar, and the DateTime. Initializes a new instance of the DateTime structure to the specified year, month, and day for the specified calendar. You can view the source for the entire set of examples from this article in either Visual Basic or C from the docs repository on GitHub. Members that appear to modify instance state actually return a new instance initialized with the new value. This Safari Heat Spielautomat | Casino.com Schweiz be useful for someone. That means two values must be expressed as the same number of ticks to be considered equal. Rather than using mktime Beste Spielothek in Greiz-Kurtschau finden a loop, James can subtract the current timestamp from the timestamp of casino info date in städte nach einwohnerzahl and divide that by the number of seconds in a day: Returns a formatted date string. Converts the value of the current DateTime object to its equivalent short time string representation. You specify one or more date and time format strings as a parameter to Beste Spielothek in Unterwart finden parsing method. Now property to measure elapsed time is dependent on the system clock. Some compilers also support declaring a DateTime value without explicitly assigning a value to it. DateTime values may also reflect moments in time in a time zone other than local and UTC.

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