"Mon, 12 Jan 1970 05:51:20"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700112
Only TIME
05:51:20
General datetime
1970-01-12 05:51:20Z
For Database
1970-01-12 05:51:20
For HTTP1.1
Mon, 12 Jan 1970 05:51:20 GMT