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10g Release 1 (10.1)
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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.


See Also:

Oracle Database Reference and Oracle Database Globalization Support Guide for information on this parameter