DB2 ROUND_TIMESTAMP function

ROUND_TIMESTAMP(CURRENT TIMESTAMP,'MI'):

The ROUND_TIMESTAMP function returns a timestamp that is the expression rounded to the unit specified by the format-string. In this case, MI means minutes.

For example, the output of

SELECT ROUND_TIMESTAMP('2008-10-16-14.46.22.121222','MI')
FROM SYSIBM.SYSDUMMY1

looks like this:
2008-10-16-14.46.00.000000