>>>As for meanings, "through" is certainly inclusive. "Until" is ambiguous; it wouldn't be clear to me whether the later date is included or not.
>>
>>Hi,
>>Why is 'until' ambiguous. If we were talking time and I said 'until three o'clock' you surely wouldn't think I meant until four o'clock. What's different with dates - does anyone interpret 'until 2007' as meaning 'until the end of 2007'?
>>At least that's the way I'll think until I die <g>
>>Best,
>>Viv
>
>If someone says "from Monday until Friday," is Friday included?
To me, No.

>Similarly, if they say "from the 12th until the 15th," is the 15th included?
Again, for me, No.

>I lean toward yes, in both cases, but I know that it could mean that it ends upon the arrival of that day/date.

Maybe it's ambiguous because it is so often wrongly used. Do you feel the same ambiguity with the time/year examples above?
Regards,
Viv