In 1875, 17 Countries Signed the Metre Convention
A quick guide to the meter—the standard unit of length—with 4 examples of where the meter is part of day-to-day life in the USA (instead of inches, yards, and miles).
Elsewhere on timeanddate.com
The Micro Flower Moon in May 2025
Explore the Micro Flower Moon in May 2025, when the Full Moon will be at its farthest point from Earth. Find out when you can best view this unique lunar event.
Moon Guide for May
In May, the Moon aligns with Venus and Saturn. Read more about May’s Moon events and what makes this month’s Full Moon special.
AM and PM Explained
How does the 12-hour clock system work? Is midnight 12 am or 12 pm?