"Tue, 03 Feb 1970 04:40:46"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700203
Only TIME
04:40:46
General datetime
1970-02-03 04:40:46Z
For Database
1970-02-03 04:40:46
For HTTP1.1
Tue, 03 Feb 1970 04:40:46 GMT