Functions for managing dates and times

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Functions for managing dates and times

Versions 16 and later

Most of these functions are now available for the Windows Phone applications.

New in version 16

Most of these functions are now available for the Windows Phone applications.

Versions 17 and later

Most of these functions are now available for the iPhone/iPad applications.

New in version 17

Most of these functions are now available for the iPhone/iPad applications.

Versions 18 and later

Most of these functions are now available in Windows Store apps mode.

New in version 18

Most of these functions are now available in Windows Store apps mode.

Versions 21 and later

Most of these functions are now available in Universal Windows 10 App mode.

New in version 21

Most of these functions are now available in Universal Windows 10 App mode.

The following functions are used to manage the dates and times:


Age	Returns the age according to the date of birth.
BankHoliday	Indicates whether a day is a bank holiday or not.
BankHolidayAdd	Indicates that a day (or a list of days) is a bank holiday.
BankHolidayDeleteAll	Clears the list of all bank holidays.
BankHolidayList	Returns the list of bank holidays defined by BankHolidayAdd.
ChronoEnd	Stops a stopwatch and returns the time passed (in milliseconds) since the start of timing (call to ChronoStart).
ChronoPause	Pauses a stopwatch in order to measure the time spent on a process.
ChronoReset	Stops and resets an existing stopwatch to zero.
ChronoResume	Restarts a stopwatch that was stopped by ChronoEnd or ChronoPause.
ChronoStart	Starts a stopwatch to find out the duration of a process (in milliseconds) and resets an existing stopwatch.
ChronoValue	Indicates the time passed (in milliseconds) since the call to ChronoStart.
CurrentMonth	Returns the current month.
CurrentYear	Returns the current year in integer format.
DateDifference	Calculates the number of days between two dates.
DatePicker	Displays the system date picker.
DateSys	Returns or modifies the system date (date of the day defined on the current computer).
DateTimeByDefault	Used to define the default value of Date, Time and DateTime variables.
DateTimeDifference	Calculates the difference between two dates and times.
DateTimeLocalToTimeZone	Converts a local date and time into the date and time of a time zone.
DateTimeLocalToUTC	Converts a date and a time expressed in local time (time zone, summer time, winter time) into a date and time expressed in universal time (UTC).
DateTimeTimeZoneToLocal	Converts a date and a time expressed in a time zone into local date and time.
DateTimeToEpoch	Converts a local date-time to the Epoch format (number of time units from 01/01/1970 at 00h00 UTC).
DateTimeToReal	Converts a date and time into an 8-byte real.
DateTimeUTCToLocal	Converts a date and a time expressed in universal time (UTC) into a date and time expressed in local time (time zone, summer time, winter time).
DateTimeValid	Checks the validity of a date/time included between January 01 0001 at 0 hour 0 minute 0 second 0 hundredth of a second and December 31 9999 at 23 hours 59 minutes 59 seconds 99 hundredths of a second.
DateToDay	Returns the day corresponding to a given date.
DateToDayInAlpha	Returns the spelled-out day of the week corresponding to the specified date.
Versions 25 and later DateToDayOfWeek New in version 25 DateToDayOfWeek DateToDayOfWeek	Returns the day of the week corresponding to a given date.
DateToInteger	Transforms a date into an integer.
DateToMonthInAlpha	Spells out the month corresponding to the specified date.
DateToString	Formats: the specified date to the specified format. the specified date time to the specified format.
DateToWeekNumber	Returns the number of the week corresponding to the specified date.
DateValid	Checks the validity of a date found between January 01 0001 and December 31 9999.
DayNumberInAlpha	Returns the name of the day of the week according to its number.
DurationToString	Formats the specified duration into the specified format.
Easter	Returns the date of Easter for the specified year according to the western Christian calendar.
EpochToDateTime	Converts a date and a time in Epoch format (number of time units since 01/01/1970 at 00h00 UTC) into a local date-time.
FirstDayOfMonth	Returns the first day of the month.
FirstDayOfWeek	Returns the date of first day of the week (which means Monday).
FirstDayOfYear	Returns the date of the first day of the year.
IntegerToDate	Transforms an integer into a date in YYYYMMDD format.
IntegerToDay	Returns the day of the week corresponding to the specified date (this date is an integer).
IntegerToDayInAlpha	Spells out the day of the week corresponding to the specified date (this date is an integer).
IntegerToMonthInAlpha	Returns and spells out the month corresponding to the specified date (this date is an integer).
IntegerToTime	Transforms an integer into a time in HHMMSSCC format.
IntegerToWeekNumber	Returns the week number in the year corresponding to the specified date (this date is an integer).
LastDayOfMonth	Returns the date of the last day for the specified month.
LastDayOfWeek	Returns the date of the last day of the week corresponding to a given date.
LeapYear	Indicates whether the specified year is a leap year or not.
MonthNumberInAlpha	Returns the name of the month according to its number.
Now	Returns or modifies the system time (current time defined for the current computer).
RealToDateTime	Coverts a 8-byte real into a date and time.
StringToDate	Transforms a date in character string format into a date in YYYYMMDD format.
StringToDuration	Transforms a duration in character string format into a duration that can be used by a Duration variable.
StringToTime	Transforms a time in character string format into a time in HHMMSSCC format, that can be used by a Time variable].
SysDateTime	Returns or modifies the system date (date and time of the day defined for the current computer).
TimeDifference	Calculates the difference between two times in hundredths of a second.
TimePicker	Displays the time picker of system.
TimeSys	Returns or modifies the system time (current time defined for the current computer).
TimeToInteger	Transforms a time into an integer.
TimeToString	Formats the time passed in a parameter according to the specified format.
TimeValid	Checks the validity of a time.
Today	Returns or modifies the system date (date of the day defined on the current computer).
Tomorrow	Returns the date of the day following the current day or a given date.
WeekNumber	Returns the week number in the year corresponding to the specified date (this date is a character string).
WeekToDate	Returns the date of the Monday for the specified week and year.
Yesterday	Returns the date of the day preceding the current day or a given date.

Related Examples:

Unit examples (WEBDEV): Management of dates

[ + ] This example presents the use of the Date type of WLanguage and the use of the functions for handling the dates.

Unit examples (WINDEV): Calculating the date of Easter and an age

[ + ] Calculating the date of Easter for a given year and calculating the age of a person at a given date.

Unit examples (WINDEV): The Chrono functions

[ + ] Using the ChronoXXX functions.
These functions are used to calculate the time passed between the start (ChronoStart) and the end (ChronoEnd).

Unit examples (WINDEV): Management of dates

[ + ] Using the Date type of WLanguage and the functions for handling dates.

Unit examples (WINDEV): Calculations on durations

[ + ] Calculations on dates and times with the WLanguage functions:
- Calculate the duration between two moments (dates and times)
- Calculate a sum of durations
- Calculate an average of durations

Training (WINDEV): WD Evaluation period

[ + ] This example explains how to limit the use of an application to a given period (evaluation period).
The following topics are presented in this example:
1/ the protection of an application for a given duration
2/ the management of the registry

Summary of the example supplied with WINDEV:
When this example is started for the first time, it is activated for an evaluation period set to 5 days.
The information regarding the date when it was first started is stored in the registry and a control key is used to check whether this date was not modified by the end user. At the end of the evaluation period, the application is locked, unless the end user provides the code for unlocking the application

Unit examples (WINDEV Mobile): The Chrono functions

[ + ] Using the WLanguage "Chrono" functions.
These functions are used to calculate the time passed between the start (ChronoStart) and the end (ChronoEnd).

Universal Apps (WINDEV Mobile): UWA Stopwatch

[ + ] This example explains how to create a stopwatch for a mobile device with WINDEV Mobile.
In this example, a timer is used to display the hands of the stopwatch and to display the time passed on a regular basis.