"Sat, 31 Jan 1970 19:42:47"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700131
Only TIME
19:42:47
General datetime
1970-01-31 19:42:47Z
For Database
1970-01-31 19:42:47
For HTTP1.1
Sat, 31 Jan 1970 19:42:47 GMT