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sqlsql-serverdatetimesql-server-2012unix-timestamp

Convert Datetime to Unix timestamp

In Microsoft SQL Server 2012 or above, is it possible to convert a datetime value to Unix time stamp in a single select statement? If so, how can it be done?

Solution

  • As Peter Halasz mentions in T-SQL DateTime to Unix Timestamp:

    Converting a datetime to unix timestamp is easy, but involves error prone typing the following:

    @timestamp=DATEDIFF(second,{d '1970-01-01'},@datetime)

    Where @datetime is the datetime value you want to convert. The {d ‘yyyy-mm-dd’} notation is an ODBC escape sequence.

    The function:

    CREATE FUNCTION UNIX_TIMESTAMP (
@ctimestamp datetime
)
RETURNS integer
AS
BEGIN
  /* Function body */
  declare @return integer
   
  SELECT @return = DATEDIFF(SECOND,{d '1970-01-01'}, @ctimestamp)
   
  return @return
END

    Try it out now like below @O A:

    SELECT UNIX_TIMESTAMP(GETDATE());