"Thu, 01 Jan 1970 18:27:23"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700101
Only TIME
18:27:23
General datetime
1970-01-01 18:27:23Z
For Database
1970-01-01 18:27:23
For HTTP1.1
Thu, 01 Jan 1970 18:27:23 GMT