Is correct to say
"the date on which [..]"? or "the date in which [..]"?

Question

Is correct to say 
"the date on which [..]"? or "the date in which [..]"?

Answer

And just to show how annoying prepositions are in English, it is worth pointing out that for months and years we would use "in" so:

May was the month in which I graduated and 1995 was the year in which I was born.

Answer

The date on which.

With days and dates, we use 'on'.

I will come on Wednesday. 
I will come on the 14th.
Let me know the date on which you will come.

Answer

Native English teacher here. Let's swap English for Spanish. live:.cid.db875d0e13d4096c