"Thu, 01 Jan 1970 21:43:35"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700101
Only TIME
21:43:35
General datetime
1970-01-01 21:43:35Z
For Database
1970-01-01 21:43:35
For HTTP1.1
Thu, 01 Jan 1970 21:43:35 GMT