"Thu, 15 Jan 1970 04:39:20"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700115
Only TIME
04:39:20
General datetime
1970-01-15 04:39:20Z
For Database
1970-01-15 04:39:20
For HTTP1.1
Thu, 15 Jan 1970 04:39:20 GMT