"Thu, 01 Jan 1970 21:47:16"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700101
Only TIME
21:47:16
General datetime
1970-01-01 21:47:16Z
For Database
1970-01-01 21:47:16
For HTTP1.1
Thu, 01 Jan 1970 21:47:16 GMT