"Fri, 02 Jan 1970 14:28:21"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700102
Only TIME
14:28:21
General datetime
1970-01-02 14:28:21Z
For Database
1970-01-02 14:28:21
For HTTP1.1
Fri, 02 Jan 1970 14:28:21 GMT