"Mon, 19 Jan 1970 04:40:31"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700119
Only TIME
04:40:31
General datetime
1970-01-19 04:40:31Z
For Database
1970-01-19 04:40:31
For HTTP1.1
Mon, 19 Jan 1970 04:40:31 GMT