"Wed, 14 Jan 1970 12:38:21"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700114
Only TIME
12:38:21
General datetime
1970-01-14 12:38:21Z
For Database
1970-01-14 12:38:21
For HTTP1.1
Wed, 14 Jan 1970 12:38:21 GMT