"Thu, 19 Feb 1970 00:19:44"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700219
Only TIME
00:19:44
General datetime
1970-02-19 00:19:44Z
For Database
1970-02-19 00:19:44
For HTTP1.1
Thu, 19 Feb 1970 00:19:44 GMT