"Sat, 24 Jan 1970 04:40:38"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700124
Only TIME
04:40:38
General datetime
1970-01-24 04:40:38Z
For Database
1970-01-24 04:40:38
For HTTP1.1
Sat, 24 Jan 1970 04:40:38 GMT