"Sat, 10 Jan 1970 04:39:01"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700110
Only TIME
04:39:01
General datetime
1970-01-10 04:39:01Z
For Database
1970-01-10 04:39:01
For HTTP1.1
Sat, 10 Jan 1970 04:39:01 GMT