How to Round DateTime Values to the Nearest Minute or Hour in T-SQL?
Round datetime value to nearest minute or hour in T-SQL
T-SQL provides built-in functions to round datetime values to the nearest minute or hour. Rounded values are valuable for data analysis and report generation.
To round a datetime value to the nearest minute, use the following formula:
dateadd(mi, datediff(mi, 0, @dt), 0)
Where, @dt
represents the datetime value to be rounded.
For example, rounding the value '09-22-2007 15:07:38.850' to the nearest minute results in '2007-09-22 15:07:00.000'.
To round a datetime value to the nearest hour, use:
dateadd(hour, datediff(hour, 0, @dt), 0)
This formula effectively truncates seconds and minutes from a datetime value. Using the same example, rounding '09-22-2007 15:07:38.850' to the nearest hour results in '2007-09-22 15:00:00.000'.
Additionally, rounding up or down can be achieved by adding half a minute or half an hour to the datetime value before truncation.
Example:
select dateadd(mi, datediff(mi, 0, dateadd(s, 30, @dt)), 0) select dateadd(hour, datediff(hour, 0, dateadd(mi, 30, @dt)), 0)
The result is:
<code>2007-09-22 15:08:00.000 2007-09-22 15:00:00.000</code>
Before the introduction of the date data type in SQL Server 2008, a similar technique was used to truncate the hours, minutes and seconds portion of a datetime value to obtain only the date. The idea is to determine the number of days between a datetime and a fixed point in time (0, meaning 1900-01-01 00:00:00.000). By adding this number of days to a fixed point in time, you get the original date with the time set to 00:00:00.000.
The above is the detailed content of How to Round DateTime Values to the Nearest Minute or Hour in T-SQL?. For more information, please follow other related articles on the PHP Chinese website!

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