"Sun, 04 Jan 1970 21:13:19"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700104
Only TIME
21:13:19
General datetime
1970-01-04 21:13:19Z
For Database
1970-01-04 21:13:19
For HTTP1.1
Sun, 04 Jan 1970 21:13:19 GMT