"Wed, 14 Jan 1970 20:37:46"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700114
Only TIME
20:37:46
General datetime
1970-01-14 20:37:46Z
For Database
1970-01-14 20:37:46
For HTTP1.1
Wed, 14 Jan 1970 20:37:46 GMT