"Mon, 09 Mar 1970 12:02:51"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700309
Only TIME
12:02:51
General datetime
1970-03-09 12:02:51Z
For Database
1970-03-09 12:02:51
For HTTP1.1
Mon, 09 Mar 1970 12:02:51 GMT