"Wed, 14 Jan 1970 05:50:40"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700114
Only TIME
05:50:40
General datetime
1970-01-14 05:50:40Z
For Database
1970-01-14 05:50:40
For HTTP1.1
Wed, 14 Jan 1970 05:50:40 GMT