Trunc Function Oracle/PLSQL?

Oracle/PLSQL: Trunc Function (with dates)

In Oracle/PLSQL, the trunc function returns a date truncated to a specific unit of measure.

The syntax for the trunc function is:

trunc ( date, [ format ] )

date is the date to truncate.

format is the unit of measure to apply for truncating. If the format parameter is omitted, the trunc function will truncate the date to the day value, so that any hours, minutes, or seconds will be truncated off.

Below are the valid format parameters:

Unit Valid format parameters
Year SYYYY, YYYY, YEAR, SYEAR, YYY, YY, Y
ISO Year IYYY, IY, I
Quarter Q
Month MONTH, MON, MM, RM
Week WW
IW IW
W W
Day DDD, DD, J
Start day of the week DAY, DY, D
Hour HH, HH12, HH24
Minute MI


Applies To:

* Oracle 8i, Oracle 9i, Oracle 10g, Oracle 11g


For example:

trunc(to_date('22-AUG-03'), 'YEAR') would return '01-JAN-03'
trunc(to_date('22-AUG-03'), 'Q') would return '01-JUL-03'
trunc(to_date('22-AUG-03'), 'MONTH') would return '01-AUG-03'
trunc(to_date('22-AUG-03'), 'DDD') would return '22-AUG-03'
trunc(to_date('22-AUG-03'), 'DAY') would return '17-AUG-03'