"Sat, 03 Jan 1970 14:09:52"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700103
Only TIME
14:09:52
General datetime
1970-01-03 14:09:52Z
For Database
1970-01-03 14:09:52
For HTTP1.1
Sat, 03 Jan 1970 14:09:52 GMT