Format Model for ROUND and TRUNC Date Functions

The table lists the format models you can use with the ROUND and TRUNC date functions and the units to which they round and truncate dates. The default model DD returns the date rounded or truncated to the day with a time of midnight.

Format model	Rounding or truncating unit
CC SCC	Century If the last two digits of a four-digit year are between 01 and 99 (inclusive), then the century is one greater than the first two digits of that year. If the last two digits of a four-digit year are 00, then the century is the same as the first two digits of that year. For example, 2002 returns 21; 2000 returns 20.
SYYYY YYYY YEAR SYEAR YYY YY Y	Year (rounds up on July 1)
IYYY IYY IY I	ISO year
Q	Quarter (rounds up on the sixteenth day of the second month of the quarter)
MONTH MON MM RM	Name of month (rounds up on the sixteenth day)
WW	Same day of the week as the first day of the year
IW	Same day of the week as the first day of the ISO week, which is Monday
W	Same day of the week as the first day of the month
DDD DD J	Day of year
DAY DY D	Starting day of the week
HH HH12 HH24	Hour
MI	Minute