"Mon, 27 Apr 1970 07:11:40"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700427
Only TIME
07:11:40
General datetime
1970-04-27 07:11:40Z
For Database
1970-04-27 07:11:40
For HTTP1.1
Mon, 27 Apr 1970 07:11:40 GMT