"Thu, 22 Jan 1970 18:13:21"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700122
Only TIME
18:13:21
General datetime
1970-01-22 18:13:21Z
For Database
1970-01-22 18:13:21
For HTTP1.1
Thu, 22 Jan 1970 18:13:21 GMT