"Thu, 15 Jan 1970 00:20:15"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700115
Only TIME
00:20:15
General datetime
1970-01-15 00:20:15Z
For Database
1970-01-15 00:20:15
For HTTP1.1
Thu, 15 Jan 1970 00:20:15 GMT