"Sat, 03 Jan 1970 04:37:18"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700103
Only TIME
04:37:18
General datetime
1970-01-03 04:37:18Z
For Database
1970-01-03 04:37:18
For HTTP1.1
Sat, 03 Jan 1970 04:37:18 GMT