"Fri, 13 Feb 1970 14:28:52"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700213
Only TIME
14:28:52
General datetime
1970-02-13 14:28:52Z
For Database
1970-02-13 14:28:52
For HTTP1.1
Fri, 13 Feb 1970 14:28:52 GMT