"Sat, 24 Jan 1970 00:20:39"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700124
Only TIME
00:20:39
General datetime
1970-01-24 00:20:39Z
For Database
1970-01-24 00:20:39
For HTTP1.1
Sat, 24 Jan 1970 00:20:39 GMT