"Wed, 18 Feb 1970 23:32:18"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700218
Only TIME
23:32:18
General datetime
1970-02-18 23:32:18Z
For Database
1970-02-18 23:32:18
For HTTP1.1
Wed, 18 Feb 1970 23:32:18 GMT