"Thu, 01 Jan 1970 21:37:46"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700101
Only TIME
21:37:46
General datetime
1970-01-01 21:37:46Z
For Database
1970-01-01 21:37:46
For HTTP1.1
Thu, 01 Jan 1970 21:37:46 GMT