"Sat, 03 Jan 1970 09:21:11"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700103
Only TIME
09:21:11
General datetime
1970-01-03 09:21:11Z
For Database
1970-01-03 09:21:11
For HTTP1.1
Sat, 03 Jan 1970 09:21:11 GMT