"Thu, 01 Jan 1970 21:40:09"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700101
Only TIME
21:40:09
General datetime
1970-01-01 21:40:09Z
For Database
1970-01-01 21:40:09
For HTTP1.1
Thu, 01 Jan 1970 21:40:09 GMT