What month day and year Martin Luther nailed the 95 theses to the church door?

Unfortunately, we can never be quite sure of what happened 500 years ago, but it is common Lutheran belief that he did thus on 'mid years day' which commonly referred to as one of the four following dates:

• 15th June
• 16th June
• 21st June
• 25th June

I sincerely hope that my answer has been very useful,

Anonymous.