Question

I have the following piece of SQL code that does the following:

1. Obviously looks at a datetime field (stored every 5 minutes)

2. Averages and rounds above-mentioned datetime field to hour. The result looks like this:

   2012-02-11 16:00:00.000
   2012-02-11 17:00:00.000
   2012-02-11 18:00:00.000
   2012-02-11 19:00:00.000
   

And here’s the code:

DATEADD(hh, DATEPART(hh, LogDetails.lastupdated), 
DATEADD(d, DATEDIFF(d, 0, LogDetails.lastupdated), 0)) AS TimePeriod

This works like a charm and the related objects average out just fine. I now need to turn this datestamp into UNIX Timestamp (for Flot charting purposes). Can someone help a bit here? Whatever I seem to be doing isn’t working, all the UNIX timestamps come in the same.

EDIT: This is finally working !!

DATEDIFF(second, '1970/01/01 00:00:00', 
DATEADD(hh, DATEPART(hh, LogDetails.lastupdated),
DATEADD(d, DATEDIFF(d, 0, LogDetails.lastupdated), 0))) as UXTIME

Answer 1

Working Example:

DECLARE @gmtOffset AS INT = DATEDIFF(second, GETDATE(), GETUTCDATE()); 
DECLARE @someDates TABLE (d DATETIME);
INSERT INTO @someDates(d) VALUES('2012-02-11 16:00:00.000');
INSERT INTO @someDates(d) VALUES('2012-02-11 17:00:00.000');
INSERT INTO @someDates(d) VALUES('2012-02-11 18:00:00.000');
INSERT INTO @someDates(d) VALUES('2012-02-11 19:00:00.000');

SELECT DATEADD(second, @gmtOffset, d) AS time_in_gmt,
       DATEDIFF(second, '1970/01/01 00:00:00', DATEADD(second, @gmtOffset, d)) AS unix_timestamp
FROM @someDates;