"Mon, 12 Jan 1970 09:23:12"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700112
Only TIME
09:23:12
General datetime
1970-01-12 09:23:12Z
For Database
1970-01-12 09:23:12
For HTTP1.1
Mon, 12 Jan 1970 09:23:12 GMT