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sqlsql-servert-sqlsql-date-functionssqldatetime
Eric
Eric

Reputation: 258

Get the max possible time of a date SQL Server

What I am trying to do is take a date in SQL Server and find the last possible hour, minute, second, and millisecond of that date.

So if the date is this: 2021-02-16 13:08:58.620

I would like to return: 2021-02-16 23:59:59.999

I have tried something like this but it is not working and I guess that I am missing something where it is converting the time and keeping the hour, minute, second and millisecond of that date

Select 
    DateAdd(MILLISECOND, -1, (Convert(datetime, DATEADD(day, 1, DateValue), 101))) as lastPossibleDate
From 
    Table1

Upvotes: 5

Views: 10266

Answers (4)

Venkataraman R
Venkataraman R

Reputation: 12959

For datetime datatype, the maximum value possible for time is : 23:59:59.997

Datetime from MSDN

We can use DateTimeFromParts to derive maximum possible datetime value for the day.

DECLARE @datevalue datetime = '2021-02-16 13:08:58.620'

SELECT DATETIMEFROMPARTS ( year(@datevalue), month(@datevalue), day(@datevalue), 23, 59, 59, 997 )  as maxPossibleValueForDay
maxPossibleValueForDay
2021-02-16 23:59:59.997

Upvotes: 2

John Cappelletti
John Cappelletti

Reputation: 81930

Just another option via format()

declare @Test datetime2(3) = '2021-02-16 13:08:58.620';

select convert(datetime2(3),format(@Test,'yyyy-MM-dd 23:59:59.999'))

Upvotes: 2

Dale K
Dale K

Reputation: 27202

Turn it into a date to truncate the time, add a day, turn it back to a datetime, subtract a millisecond...

declare @Test datetime2(3) = '2021-02-16 13:08:58.620';

select dateadd(millisecond, -1, convert(datetime2(3),dateadd(day, 1, convert(date, @Test))));
Result
2021-02-16 23:59:59.999

Note if you use straight datetime rather than datetime(2) your accuracy is only down to 3ms. datetime(2) is the recommended datetime datatype to use.

Upvotes: 7

Stu
Stu

Reputation: 32579

Another simply way would be to cast your datetime to a date and just concatenate it with the maximum possibly time for your given precision. If you want accuracy to 3 decimal places you need to use datetime2(3)

declare @date datetime='20210216 13:08:58.620';

select Convert(datetime2(3),Concat(convert(date,@date),' 23:59:59.999'));

Upvotes: 2

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