"Wed, 04 Feb 1970 18:15:55"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700204
Only TIME
18:15:55
General datetime
1970-02-04 18:15:55Z
For Database
1970-02-04 18:15:55
For HTTP1.1
Wed, 04 Feb 1970 18:15:55 GMT