"Sat, 03 Jan 1970 12:00:51"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700103
Only TIME
12:00:51
General datetime
1970-01-03 12:00:51Z
For Database
1970-01-03 12:00:51
For HTTP1.1
Sat, 03 Jan 1970 12:00:51 GMT