"Sun, 01 Feb 1970 15:13:03"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700201
Only TIME
15:13:03
General datetime
1970-02-01 15:13:03Z
For Database
1970-02-01 15:13:03
For HTTP1.1
Sun, 01 Feb 1970 15:13:03 GMT