"Sun, 04 Jan 1970 21:44:14"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700104
Only TIME
21:44:14
General datetime
1970-01-04 21:44:14Z
For Database
1970-01-04 21:44:14
For HTTP1.1
Sun, 04 Jan 1970 21:44:14 GMT