"Tue, 03 Feb 1970 18:15:42"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700203
Only TIME
18:15:42
General datetime
1970-02-03 18:15:42Z
For Database
1970-02-03 18:15:42
For HTTP1.1
Tue, 03 Feb 1970 18:15:42 GMT