"Sun, 01 Feb 1970 21:46:17"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700201
Only TIME
21:46:17
General datetime
1970-02-01 21:46:17Z
For Database
1970-02-01 21:46:17
For HTTP1.1
Sun, 01 Feb 1970 21:46:17 GMT