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