"Mon, 05 Jan 1970 20:42:35"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700105
Only TIME
20:42:35
General datetime
1970-01-05 20:42:35Z
For Database
1970-01-05 20:42:35
For HTTP1.1
Mon, 05 Jan 1970 20:42:35 GMT