"Thu, 08 Jan 1970 21:44:21"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700108
Only TIME
21:44:21
General datetime
1970-01-08 21:44:21Z
For Database
1970-01-08 21:44:21
For HTTP1.1
Thu, 08 Jan 1970 21:44:21 GMT