"Fri, 02 Jan 1970 00:38:03"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700102
Only TIME
00:38:03
General datetime
1970-01-02 00:38:03Z
For Database
1970-01-02 00:38:03
For HTTP1.1
Fri, 02 Jan 1970 00:38:03 GMT