"Sun, 01 Feb 1970 04:43:03"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700201
Only TIME
04:43:03
General datetime
1970-02-01 04:43:03Z
For Database
1970-02-01 04:43:03
For HTTP1.1
Sun, 01 Feb 1970 04:43:03 GMT