"Sat, 17 Jan 1970 02:46:47"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700117
Only TIME
02:46:47
General datetime
1970-01-17 02:46:47Z
For Database
1970-01-17 02:46:47
For HTTP1.1
Sat, 17 Jan 1970 02:46:47 GMT