New Date issues

I am working on what appears to be a bug, but I am not sure where exactly.
I am creating a new date without specifying a time portion. So, hours and
seconds are equal 0.
If this date is between March 10 and March 23 (did not try all a way to the
end of March) then according to Charles a date that is sent to the server
is one day less. Any other month is not affected by this potential bug.
Anyone has any explanation?

Thanks