Sindarin Calendar

I was wondering, where would I find the most accurate Sindarin Calendar?

The most accurate Tolkien calendars website has language options but its goal does not concern the languages (unlike your question, I think). And since Tolkien did not provide Sindarin forms of all the Quenya terms, some words remain as Quenya even with the Sindarin option. For example Q. enderi "middle-days" remains untranslated because Tolkien did not provide the Sindarin cognate (which would have been *enedhoer).

Thanks!