"Fri, 02 Jan 1970 04:39:20"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700102
Only TIME
04:39:20
General datetime
1970-01-02 04:39:20Z
For Database
1970-01-02 04:39:20
For HTTP1.1
Fri, 02 Jan 1970 04:39:20 GMT