"Wed, 14 Jan 1970 00:40:20"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700114
Only TIME
00:40:20
General datetime
1970-01-14 00:40:20Z
For Database
1970-01-14 00:40:20
For HTTP1.1
Wed, 14 Jan 1970 00:40:20 GMT