"Fri, 02 Jan 1970 23:37:21"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700102
Only TIME
23:37:21
General datetime
1970-01-02 23:37:21Z
For Database
1970-01-02 23:37:21
For HTTP1.1
Fri, 02 Jan 1970 23:37:21 GMT