Rounds one part of a date. You can also use ROUND to round numbers.
This functions can round the following parts of a date:
•Year. Rounds the year portion of a date based on the month. If the month is between January and June, the function returns January 1 of the input year, and sets the time to 00:00:00. If the month is between July and December, the function returns January 1 of the next year with the time set to 00:00:00. For example, the expression ROUND(06/30/1998 2:30:55, 'YY') returns 01/01/1998 00:00:00, and ROUND(07/1/1998 3:10:15, 'YY') returns 1/1/1998 00:00:00.
•Month. Rounds the month portion of a date based on the day of the month. If the day of the month is between 1 and 15, it rounds the date to the first day of the input month with the time set to 00:00:00. If the day of the month is between 16 and the last day of the month, it rounds to the first day of the next month with the time set to 00:00:00. For example, the expression ROUND(4/15/1998 12:15:00, 'MM') returns 4/1/1998 00:00:00, and ROUND(4/16/1998 8:24:19, 'MM') returns 5/1/1998 00:00:00.
•Day. Rounds the day portion of the date based on the time. If the time is between 00:00:00 (12AM) and 11:59:59AM, the function returns the current date with the time set to 00:00:00 (12AM). If the time is 12:00:00 (12PM) or later, the function rounds the date to the next day with the time set to 00:00:00 (12AM). For example, the expression ROUND(06/13/1998 2:30:45, 'DD') returns 06/13/1998 00:00:00, and ROUND(06/13/1998 22:30:45, 'DD') returns 06/14/1998 00:00:00.
•Hour. Rounds the hour portion of the date based on the minutes in the hour. If the minute portion of the time is between 0 and 29, the function returns the current hour with the minutes and seconds set to 0. If the minute portion is 30 or greater, the function rounds to the next hour and sets the minutes and seconds to 0. For example, the expression ROUND(04/01/1998 11:29:35, 'HH') returns 04/01/1998 11:00:00, and ROUND(04/01/1998 13:39:00, 'HH') returns 04/01/1998 14:00:00.
•Minute. Rounds the minute portion of the date based on the seconds. If time has 0 to 29 seconds, the function returns the current minutes and sets the seconds to 0. If the time has 30 to 59 seconds, the function rounds to the next minute and sets the seconds to 0. For example, the expression ROUND(05/22/1998 10:15:29, 'MI') returns 05/22/1998 10:15:00, and ROUND(05/22/1998 10:15:30, 'MI') returns 05/22/1998 10:16:00.
Syntax
ROUND( date [,format] )
Argument
Required/
Optional
Description
date
Required
Date/Time datatype. You can nest TO_DATE to convert strings to dates before rounding.
format
Optional
Enter a valid format string. This is the portion of the date that you want to round. You can round only one portion of the date. If you omit the format string, the function rounds the date to the nearest day.
Return Value
Date with the specified part rounded. ROUND returns a date in the same format as the source date. You can link the results of this function to any column with a Date/Time datatype.
NULL if you pass a null value to the function.
Example
The following expressions round the year portion of dates in the DATE_SHIPPED column: