"Tue, 20 Jan 1970 02:16:49"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700120
Only TIME
02:16:49
General datetime
1970-01-20 02:16:49Z
For Database
1970-01-20 02:16:49
For HTTP1.1
Tue, 20 Jan 1970 02:16:49 GMT