"Sat, 31 Jan 1970 04:40:46"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700131
Only TIME
04:40:46
General datetime
1970-01-31 04:40:46Z
For Database
1970-01-31 04:40:46
For HTTP1.1
Sat, 31 Jan 1970 04:40:46 GMT