"Sat, 10 Jan 1970 04:40:39"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700110
Only TIME
04:40:39
General datetime
1970-01-10 04:40:39Z
For Database
1970-01-10 04:40:39
For HTTP1.1
Sat, 10 Jan 1970 04:40:39 GMT