"Mon, 05 Jan 1970 14:42:50"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700105
Only TIME
14:42:50
General datetime
1970-01-05 14:42:50Z
For Database
1970-01-05 14:42:50
For HTTP1.1
Mon, 05 Jan 1970 14:42:50 GMT