"Wed, 14 Jan 1970 20:42:29"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700114
Only TIME
20:42:29
General datetime
1970-01-14 20:42:29Z
For Database
1970-01-14 20:42:29
For HTTP1.1
Wed, 14 Jan 1970 20:42:29 GMT