"Wed, 14 Jan 1970 04:38:31"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700114
Only TIME
04:38:31
General datetime
1970-01-14 04:38:31Z
For Database
1970-01-14 04:38:31
For HTTP1.1
Wed, 14 Jan 1970 04:38:31 GMT