"Sat, 31 Jan 1970 07:46:48"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700131
Only TIME
07:46:48
General datetime
1970-01-31 07:46:48Z
For Database
1970-01-31 07:46:48
For HTTP1.1
Sat, 31 Jan 1970 07:46:48 GMT