"Sun, 01 Feb 1970 11:21:20"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700201
Only TIME
11:21:20
General datetime
1970-02-01 11:21:20Z
For Database
1970-02-01 11:21:20
For HTTP1.1
Sun, 01 Feb 1970 11:21:20 GMT