"Sat, 14 Feb 1970 00:19:49"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700214
Only TIME
00:19:49
General datetime
1970-02-14 00:19:49Z
For Database
1970-02-14 00:19:49
For HTTP1.1
Sat, 14 Feb 1970 00:19:49 GMT