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DATETIME_SUB

Subtracts a specified time interval from a date.

Sample usage

DATETIME_SUB(Order Date, INTERVAL 1 WEEK)

Syntax

DATETIME_SUB( datetime_expression, INTERVAL integer part )

Parameters

datetime_expression - a Date or a Date & Time field or expression.
integer - a whole numeric field or expression representing the number of parts to subtract.
part - the unit of time measurement to subtract. DATETIME_ADD supports the following values for part:
- MICROSECOND: available for Date & Time fields or expressions.
- MILLISECOND: available for Date & Time fields or expressions.
- SECOND: available for Date & Time fields or expressions.
- MINUTE: available for Date & Time fields or expressions.
- HOUR: available for Date & Time fields or expressions.
- DAY
- WEEK: This date part begins on Sunday.
- ISOWEEK: Uses ISO 8601 week boundaries. ISO weeks begin on Monday.
- MONTH
- QUARTER
- YEAR
- ISOYEAR: Uses the ISO 8601 week-numbering year boundary. The ISO year boundary is the Monday of the first week whose Thursday belongs to the corresponding Gregorian calendar year.

Return data type

Date & Time

Examples

Example formula	Output
`DATETIME_SUB(DATETIME "2008-12-25 15:30:00", INTERVAL 10 MINUTE)`	2008年12月25日 15:20:00
`DATETIME_SUB(DATE "2008-12-25", INTERVAL 5 DAY)`	2008年12月20日

Notes

This function is not available for compatibility mode date types.

Special handling is required for MONTH, QUARTER, and YEAR parts when the date is at (or near) the last day of the month. If the resulting month has fewer days than the original Date or Date & Time's day, then the result day is the last day of the new month.