I have a varchar column named [Dato Time] which contains values like:

2011-05-12 00
2011-05-12 01
2011-05-12 02

So, a date and a Hour-specific time.

I would like to split the date and the time up in two columns, a column named [Dato] with datatype date and a column named Time with datatype time(7).

I extracted the date-part with the following substring:

UPDATE Dato_Time SET [Dato] = SUBSTRING([Dato Time], 1, 10)

This worked without any problem. But when I try to run the same code for the time-part:

UPDATE Dato_Time SET [Time] = SUBSTRING([Dato Time], 12, 13)

It gives me the following error:

Conversion failed when converting date and/or time from character string.

Any ideas?


1 Answer 1


Since Char 12 and 13 seem to be hours, with SQL Server 2012, you can build a new time using this part and 0 for missing parts:

TIMEFROMPARTS ( hour, minute, seconds, fractions, precision )

Select TIMEFROMPARTS(SUBSTRING([Dato Time], 12, 13), 0, 0, 0, 0) 


With SQL Server prior to 2012, you can use such queries:

Select DATEADD(HOUR, Cast(SUBSTRING(@x, 12, 13) as int), CAST('00:00' as time))
Select Cast(SUBSTRING(@x, 12, 13)+':00' as time)
  • Thanks @Julien Select TIMEFROMPARTS(SUBSTRING([Dato Time], 12, 13), 0, 0, 0, 0) solved the issue for me. No need for the "old" code, as I'm running 2014. But thanks again.
    – dmh
    Oct 26, 2015 at 9:13
  • 1
    @dmh: Please note also that the third parameter of SUBSTRING is a length, not a position. I'm guessing you want to cut 2 characters at the position of 12 for the time column – therefore the SUBSTRING call should be CAST(SUBSTRING([Dato Time], 12, 2).
    – Andriy M
    Oct 26, 2015 at 9:38
  • @Andriy, Select TIMEFROMPARTS(SUBSTRING([Dato Time], 12, 13), 0, 0, 0, 0) Gave me this output: 00:00:00.0000000 01:00:00.0000000 etc. Which is fine for me. Although this would have been more than enough: 00:00 01:00
    – dmh
    Oct 26, 2015 at 10:02
  • The output is of type Time. Therefore it looks like 00:00:00.000000. You should store it using this type and avoid varchar such as 00:00. Oct 26, 2015 at 10:04
  • 1
    @dmh: Yes, 13 instead of 2 works in this case, because the characters you are extracting are the last two characters of the string – any integer value greater than 2 would give you the last two characters. I'm just pointing out a seeming misconception on your side, because it seemed to me you thought the syntax of SUBSTRING was SUBSTRING(string_value, start_pos, end_pos), while in fact it's SUBSTRING(string_value, start_pos, length).
    – Andriy M
    Oct 26, 2015 at 10:14

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