"Thu, 15 Jan 1970 19:39:38"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700115
Only TIME
19:39:38
General datetime
1970-01-15 19:39:38Z
For Database
1970-01-15 19:39:38
For HTTP1.1
Thu, 15 Jan 1970 19:39:38 GMT