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DATE FirstDayOfMonth (date)
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Returns the date of the first day of the month relatively to the given date
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DATE FirstDayOfNextMonth (date)
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Returns the date of the first day of the next month relatively to the given
date
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DATE FirstDayOfWeek (date)
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Returns the date of the first day in the given week
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DATE FirstDayOfYear (date)
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Returns the date of January 1st relatively to the given date
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LOGICAL IsLeapYear (date)
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Returns true when the date of the given date is in a leap year
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INTEGER IsoWeekDay (date)
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Returns the week day (1..7) using the ISO 8601 norm used in Germany
and most European countries where the week starts with Monday
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INTEGER LastDayNumberOfMonth (date)
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Returns the day number of the last day of the month relatively
to the given date
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DATE LastDayOfMonth (date)
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Returns the date of the last day of the month relatively to the given date
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DATE LastDayOfWeek (date)
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Returns the date of the last day in the given week
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DATE LastDayOfYear (date)
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Returns the date of December 31st relatively to the given date
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INTEGER WeekNumber (date)
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Returns the week number of the given date
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