"Tue, 20 Jan 1970 04:40:29"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700120
Only TIME
04:40:29
General datetime
1970-01-20 04:40:29Z
For Database
1970-01-20 04:40:29
For HTTP1.1
Tue, 20 Jan 1970 04:40:29 GMT