"Sun, 04 Jan 1970 14:37:12"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700104
Only TIME
14:37:12
General datetime
1970-01-04 14:37:12Z
For Database
1970-01-04 14:37:12
For HTTP1.1
Sun, 04 Jan 1970 14:37:12 GMT