"Mon, 09 Feb 1970 12:02:21"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700209
Only TIME
12:02:21
General datetime
1970-02-09 12:02:21Z
For Database
1970-02-09 12:02:21
For HTTP1.1
Mon, 09 Feb 1970 12:02:21 GMT