"Mon, 18 May 1970 07:11:23"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700518
Only TIME
07:11:23
General datetime
1970-05-18 07:11:23Z
For Database
1970-05-18 07:11:23
For HTTP1.1
Mon, 18 May 1970 07:11:23 GMT