About Weekday Calendar

Render a month-at-a-glance calendar grid — YYYY-MM input. Part of the DevTools Surf developer suite. Browse more tools in the Date / Time collection.

Use Cases

• Project managers visualizing sprint timelines month by month
• Developers checking what day of the week a release date falls on
• HR teams planning shift schedules around weekday patterns
• Teachers generating printable monthly calendar grids for classes

Tips

• Enter a YYYY-MM value to render any month grid instantly
• Use the grid to plan sprint schedules and deadlines visually
• Navigate between months to compare weekday distributions

Fun Facts

• The 7-day week has no astronomical basis — it was adopted from the Babylonian calendar around 600 BCE and spread through Roman and later Christian traditions.
• The ISO 8601 standard defines Monday as day 1 of the week, while the U.S. convention starts weeks on Sunday — a difference that causes endless localization bugs.
• February 2026 is notable because it starts on a Sunday and ends on a Saturday, filling the calendar grid perfectly with no wasted rows — this happens roughly every 11 years.

FAQ

What does it render?

A month-at-a-glance calendar grid with dates. Input YYYY-MM; output is the 5-6-week grid for that month.

Starts Monday or Sunday?

Configurable — Monday (ISO standard, most of the world) or Sunday (US default). Affects the grid column arrangement.

Includes previous/next month dates?

Yes — the grid shows 5-6 complete weeks, with gray-out dates from adjacent months filling the corners.

Holidays?

Not in this tool. For holiday-highlighted calendars use a regional calendar tool (calendar.me, timeanddate.com).