"Sat, 17 Jan 1970 07:55:49"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700117
Only TIME
07:55:49
General datetime
1970-01-17 07:55:49Z
For Database
1970-01-17 07:55:49
For HTTP1.1
Sat, 17 Jan 1970 07:55:49 GMT