"Thu, 19 Feb 1970 19:40:39"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700219
Only TIME
19:40:39
General datetime
1970-02-19 19:40:39Z
For Database
1970-02-19 19:40:39
For HTTP1.1
Thu, 19 Feb 1970 19:40:39 GMT