"Mon, 18 May 1970 07:10:57"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700518
Only TIME
07:10:57
General datetime
1970-05-18 07:10:57Z
For Database
1970-05-18 07:10:57
For HTTP1.1
Mon, 18 May 1970 07:10:57 GMT