"Wed, 18 Feb 1970 12:54:39"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700218
Only TIME
12:54:39
General datetime
1970-02-18 12:54:39Z
For Database
1970-02-18 12:54:39
For HTTP1.1
Wed, 18 Feb 1970 12:54:39 GMT