"Thu, 22 Jan 1970 21:42:51"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700122
Only TIME
21:42:51
General datetime
1970-01-22 21:42:51Z
For Database
1970-01-22 21:42:51
For HTTP1.1
Thu, 22 Jan 1970 21:42:51 GMT