"Fri, 02 Jan 1970 21:42:54"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700102
Only TIME
21:42:54
General datetime
1970-01-02 21:42:54Z
For Database
1970-01-02 21:42:54
For HTTP1.1
Fri, 02 Jan 1970 21:42:54 GMT