Returned BIGINT Being Cast To String

[jason-bean]

In my SQL statement I am converting a DATETIME column to UTC, then converting it to a UNIX timestamp, casting it to a BIGINT and multiplying by 1000. The result for "x" that I get is a string instead of a number. The Temperature column is being converted to a float like it should.

query: "SELECT TempId AS id, Temperature AS y, CAST(DATEDIFF(SECOND,{d '1970-01-01'}, DATEADD(SECOND, DATEDIFF(SECOND, GETDATE(), GETUTCDATE()), Recorded)) AS BIGINT) * 1000 AS x " + 'FROM templog ' + 'WHERE Recorded >= DATEADD(MINUTE, DATEPART(tzoffset, sysdatetimeoffset()), @startDate) ' + 'AND Recorded <= DATEADD(MINUTE, DATEPART(tzoffset, sysdatetimeoffset()), @endDate) ' + 'ORDER BY Recorded ASC'

{"id":70437,"y":68,"x":"1460467802000"}