Free Calendar & Date Tools

A free set of date tools that run entirely in your browser — calculate the days between two dates, add or subtract days, count down to any date, find the week number, and check leap years. No sign-up, nothing uploaded.

Today–  ISO week–  Day of year–  Days left in year–until New Year

Calculate

Date Calculator

Days between two dates, or add and subtract days, weeks, months and years from any date. Includes weekday and business-day counts.

Days Until Any Date

A live countdown to any date you choose — plus ready-made counters for Christmas, New Year, Halloween, Thanksgiving and summer.

Week Number

What week is it? See the current ISO-8601 week number, or look up the week number, week of year and day of year for any date.

Weeks

How Many Weeks in a Year

52 or 53? The exact count, why some years get a 53rd week under ISO-8601, and which upcoming years those are.

How Many Weeks in a Month

About 4.3 weeks — plus a months-to-weeks table for 2, 3, 4, 6, 9 months and more.

Months to Weeks

Convert any number of months to weeks, using the 30.44-day average or the exact span from a start date.

Reference

Yearly Calendar

The whole year on one printable page — all 12 months, weekends in red, with selectable weekend days. Updates to the new year automatically.

How Many Days in a Year

365 or 366? A clear answer with the leap-year rule, the weeks-and-months breakdown, and a year-by-year table through 2033.

Leap Year Checker

Is a given year a leap year? Instant answer with the divisible-by-4 rule and a table of upcoming leap years.
100% free, no sign-up Runs in your browser — nothing uploaded Instant, works offline

Countdown to a holiday

Ready-made countdowns with a live timer — holidays and observances, each with the exact date and days remaining.

How many weeks are in…

Exact week counts for common month spans, including how the part-weeks fall.

One place for everyday date math

Whether you're counting down to a deadline, working out an anniversary, or checking which week of the year it is, these tools give you an exact answer in a click.

Dates are deceptively tricky: months have different lengths, leap years add a day every four years (with exceptions), and "how many weeks until…" depends on where you start counting. Each tool here handles those edge cases correctly using calendar-accurate math, so you don't have to count on your fingers or wrestle with a spreadsheet formula.

Everything is calculated locally in your browser. That means results are instant, your dates never leave your device, and the tools keep working even without a connection. Pick a tool above to get started, or jump straight to the date calculator — the most versatile of the set.

Frequently Asked Questions

Are these calendar tools free?
Every calendar tool on LK Forge is free, with no sign-up and no limits. All the date math runs in your browser, so nothing you type is uploaded to a server. There are no accounts, no usage caps and no paid tier holding features back. Printing a calendar or a countdown costs nothing either.
Do the tools work offline?
Once a page has loaded, calculations run entirely on your device with plain JavaScript, so they keep working even if your connection drops. There is no server round-trip for any result. A connection is needed only for the first load of a page, which fetches the HTML, a small stylesheet and a script. After that a countdown or a date calculation completes in the browser and stays accurate for as long as your device clock is right.
Which tool counts the days between two dates?
The Date Calculator counts the days between two dates. Its difference mode gives the exact number of days between them, plus the breakdown in years, months and days, the number of weeks, and the number of weekdays in the span. The same tool runs the other direction too, adding or subtracting days, weeks, months or years from a start date. For a specific months-to-weeks conversion instead, the Months to Weeks Converter handles that directly.
Can I count down to a holiday or a personal date?
Counting down to a holiday or a personal date is exactly what the Days Until tool does. It counts down to any date you pick, and there are dedicated live countdowns for Christmas, New Year, Halloween, Thanksgiving and the first day of summer. Dated pages cover the rest of the calendar too, from Valentine's Day and Easter through to Black Friday and Tax Day. For a date with no page of its own, enter it in the tool and the countdown works the same way.

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