"Thu, 01 Jan 1970 21:13:58"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700101
Only TIME
21:13:58
General datetime
1970-01-01 21:13:58Z
For Database
1970-01-01 21:13:58
For HTTP1.1
Thu, 01 Jan 1970 21:13:58 GMT