the meanings of "the/a/(zero) Christmas Eve"

[vgv8]

What are the differences in meaning of:
- On the Christmas Eve
- On a Christmas Eve
- On Christmas Eve
?

 

[bhaisahab]

What are the differences in meaning of:
- On the Christmas Eve This one is unlikely in most contexts.
- On a Christmas Eve "On a Christmas eve sometime in the past or future, which one is either unknown or unimportant."
- On Christmas Eve The usual way to say it.
?

Bhai.

 

[apex2000]

You might want to say - on the Christmas eve before last.
Or - on the Christmas eve night ( to specify which of a number of nights under discussion).

 

[vgv8]

You might want to say - on the Christmas eve before last.
Or - on the Christmas eve night ( to specify which of a number of nights under discussion).

And if I want to say "on the Christmas 2011 eve"?

 

[bhaisahab]

And if I want to say "on the Christmas 2011 eve"?

"On Christmas Eve 2011" or possibly "On the eve of Christmas 2011".