"Sun, 04 Jan 1970 14:57:56"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700104
Only TIME
14:57:56
General datetime
1970-01-04 14:57:56Z
For Database
1970-01-04 14:57:56
For HTTP1.1
Sun, 04 Jan 1970 14:57:56 GMT