"Tue, 20 Jan 1970 01:00:02"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700120
Only TIME
01:00:02
General datetime
1970-01-20 01:00:02Z
For Database
1970-01-20 01:00:02
For HTTP1.1
Tue, 20 Jan 1970 01:00:02 GMT