"Thu, 01 Jan 1970 12:33:20"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700101
Only TIME
12:33:20
General datetime
1970-01-01 12:33:20Z
For Database
1970-01-01 12:33:20
For HTTP1.1
Thu, 01 Jan 1970 12:33:20 GMT