"Thu, 01 Jan 1970 21:43:46"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700101
Only TIME
21:43:46
General datetime
1970-01-01 21:43:46Z
For Database
1970-01-01 21:43:46
For HTTP1.1
Thu, 01 Jan 1970 21:43:46 GMT