"Sat, 03 Jan 1970 04:39:17"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700103
Only TIME
04:39:17
General datetime
1970-01-03 04:39:17Z
For Database
1970-01-03 04:39:17
For HTTP1.1
Sat, 03 Jan 1970 04:39:17 GMT