"Sun, 11 Jan 1970 14:57:57"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700111
Only TIME
14:57:57
General datetime
1970-01-11 14:57:57Z
For Database
1970-01-11 14:57:57
For HTTP1.1
Sun, 11 Jan 1970 14:57:57 GMT