ROUND and TRUNC Date Functions
Table 7-13 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.
Table 7-13 Date Format Models for the ROUND and TRUNC Date Functions
| Format Model | Rounding or Truncating Unit |
|---|---|
CC SCC |
One greater than the first two digits of a four-digit year |
SYYYY YYYY YEAR SYEAR YYY YY Y |
Year (rounds up on July 1) |
IYYY IY IY I |
ISO Year |
Q |
Quarter (rounds up on the sixteenth day of the second month of the quarter) |
MONTH MON MM RM |
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 year |
W |
Same day of the week as the first day of the month |
DDD DD J |
Day |
DAY DY D |
Starting day of the week |
HH HH12 HH24 |
Hour |
MI |
Minute |
The starting day of the week used by the format models DAY, DY, and D is specified implicitly by the initialization parameter NLS_TERRITORY.