"Sun, 18 Jan 1970 14:56:41"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700118
Only TIME
14:56:41
General datetime
1970-01-18 14:56:41Z
For Database
1970-01-18 14:56:41
For HTTP1.1
Sun, 18 Jan 1970 14:56:41 GMT