您可以按照以下方式将时间舍入到任意给定的分钟数:
DateAdd(Minute, (DateDiff(minute, 0, getutcdate() )/15) * 15, 0)
不必使用 getutcdate()
,您可以使用您的日期列、变量或表达式。此外,分钟数也可以是一个变量。
declare @minutesQuantize int set @minutesQuantize = 15
DateAdd(Minute, (DateDiff(minute, 0, getutcdate() )/@minutesQuantize) * @minutesQuantize, 0)
唯一的规则是日期差必须适合于整数,即小于20亿。这意味着如果没有更复杂的表达式,您不能使用秒或毫秒。
如果您需要秒或毫秒,请按照以下步骤操作:
dateadd(ms, (datediff(ms, dateadd(day, datediff(day, 0, @date), 0), @date)/@msInterval)*@msInterval, dateadd(day, datediff(day, 0, @date), 0))
或者,如果你想将其封装成一个函数:
create function dbo.DateRoundMinutes(@dt datetime, @minutes int)
returns datetime
as begin
return DateAdd(Minute, (DateDiff(minute, 0, @dt )/@minutes) * @minutes, 0)
end
go
create function dbo.DateRoundMilliseconds(@dt datetime, @ms int)
returns datetime
as begin
return dateadd(ms, (datediff(ms, dateadd(day, datediff(day, 0, @dt), 0), @dt)/@ms)*@ms, dateadd(day, datediff(day, 0, @dt), 0))
end
你可以像这样使用:
select t.dt,
dbo.DateRoundMilliseconds(dt, 500) dt0_5Second,
dbo.DateRoundMilliseconds(dt, 5000) dt5second,
dbo.DateRoundMilliseconds(dt, 15000) dt15Second,
dbo.DateRoundMilliseconds(dt, 90000) dt90Second,
dbo.DateRoundMinutes(dt, 2) dt2Minute,
dbo.DateRoundMinutes(dt, 5) dt5Minute,
dbo.DateRoundMinutes(dt, 15) dt15Minute,
dbo.DateRoundMinutes(dt, 90) dt90Minute
from