"Wed, 04 Feb 1970 20:38:09"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700204
Only TIME
20:38:09
General datetime
1970-02-04 20:38:09Z
For Database
1970-02-04 20:38:09
For HTTP1.1
Wed, 04 Feb 1970 20:38:09 GMT