SUBTRACT_YEARS

Description

SUBTRACT_YEARS takes a date, from either an information or in ISO8601 format, and a number of years to subtract, and returns a date with the given number of years subtracted.

In the special case that the new year doesn't contain the original date (e.g. when subtracting a year from the leap day 29.02.2016) the new date will have the same number of days from the beginning of the year (e.g. 01.03.2015 in the earlier example).

Example: Date

SUBTRACT_YEARS(NOW(), 18)

This expression returns the current date 18 years ago.

SUBTRACT_YEARS('2000-01-01, 18)

This returns the 1st January 1982

Example: Date with time

If you specify not just a date, but a date and time in ISO8601 format, the function includes the time in the calculation.

SUBTRACT_YEARS('2000-01-01T09:35:23', 18)

This returns also the 1st January 1982, but at 9:35:23, so 1982-01-01T09:35:23.