"Fri, 02 Jan 1970 21:40:05"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700102
Only TIME
21:40:05
General datetime
1970-01-02 21:40:05Z
For Database
1970-01-02 21:40:05
For HTTP1.1
Fri, 02 Jan 1970 21:40:05 GMT