"Wed, 18 Feb 1970 11:25:21"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700218
Only TIME
11:25:21
General datetime
1970-02-18 11:25:21Z
For Database
1970-02-18 11:25:21
For HTTP1.1
Wed, 18 Feb 1970 11:25:21 GMT