31 October
In short
31 October is the 304th day of the year in the Gregorian calendar, with 61 days remaining until the end of the year.
In plain words
It is the final day of October. In many Western cultures, it is most famously known as Halloween.
A simple example
Children often dress up in costumes and go trick-or-treating on this evening.
Why it matters
It marks the transition into the final months of the year and is a major date for seasonal celebrations and holidays.
Easy to mix up
It is often confused with All Saints' Day, which occurs on 1 November.