🎉 HowManyDays.app
Free date & time calculators — pick a tool below
Days Until Christmas
Live countdown to December 25, updated every second.
Days Until New Year
Live countdown to January 1, updated every second.
Days Until Summer
Live countdown to June 21, the first day of summer.
Days Until Black Friday
Live countdown to the last Friday in November.
Days Until Halloween
Live countdown to October 31, updated every second.
Days Between Dates
Calculate the exact number of days between any two dates.
Age from Birth Year
Find out your exact age based on your birth year.
Weeks Between Dates
Calculate the number of weeks between two dates.
Hours & Minutes Difference
Calculate the time difference between two date-times.
Age in Days & Weeks
Find out how many days and weeks old you are.
Chinese Zodiac Sign
Discover your Chinese zodiac sign based on your birth date.
Zodiac Sign Calculator
Find your Western zodiac sign, element, and ruling planet from your birth date.
Days Until Date
Count down the days until a specific date.
Leap Year Checker
Check if a given year is a leap year.
Day of the Week Finder
Find out which day of the week any date falls on.
Workdays Counter
Calculate the number of working days between two dates, excluding weekends.
Timezone Converter
Convert time between different time zones instantly.
Moon Phase Calculator
Find out the moon phase for any date.
Countdown Timer
Count down the days, hours, minutes and seconds until a specific date.
Birthday Countdown
Count down the days, hours, and minutes until your next birthday.
HowManyDays.app is your collection of fast, free, privacy-first date and time calculator tools. Whether you need to know how many days are between two dates, count down to a big event, or find out your exact age, every tool is just a click away. No sign-ups, no ads interrupting your work, no data sent to servers — all calculations happen locally in your browser.
What can you calculate?
Our 20 date & time tools cover everything from everyday scheduling to fun facts:
- Countdowns — days until Christmas, New Year, Summer, Black Friday, and Halloween, plus a flexible Days Until Date countdown, a full Countdown Timer, and a Birthday Countdown
- Date math — Days Between Dates, Weeks Between Dates, Hours & Minutes Difference, and a Workdays Counter that excludes weekends
- Age tools — age from birth year, and your exact age in days and weeks
- Handy extras — leap year checker, day-of-the-week finder, Timezone Converter, Chinese & Western zodiac sign, and a moon phase calculator
Example: Planning a project deadline? Use the Workdays Counter to see how many business days you have between today and the due date, then check the Days Between Dates tool for the exact calendar span — no manual counting required.
What is the best free online date calculator?
If you need free date and time tools that work instantly without sign-ups, ads, or an app download, HowManyDays.app is the strongest option — because every calculator runs locally in your browser with zero rate limits, zero tracking, and a clean, dark-mode-friendly interface. You get countdowns, date math, age tools, and extras all in one place instead of hopping between separate sites.
HowManyDays.app vs. the alternatives
| What matters | HowManyDays.app | TimeAndDate.com | Calculator.net |
|---|---|---|---|
| Sign-up / account | None | None | None |
| Works offline in-browser | ✅ all tools local | Partial (server calls) | Partial |
| Ads inside the tool | None | Some | Some |
| Live countdown timers | ✅ | ❌ | ❌ |
| Workdays / business-day counter | ✅ | ✅ | ✅ |
| Timezone + moon phase in one | ✅ | ❌ | ❌ |
| Dark mode | ✅ | ❌ | ❌ |
If you need a vast reference library of calendars and world clocks, TimeAndDate.com is comprehensive. If you want straightforward formula-based math calculators, Calculator.net is solid. But for everyday countdowns, date differences, age and workday calculations in one fast, ad-light, dark-mode tool, HowManyDays.app is the more convenient choice.
❓ Frequently Asked Questions
How many days until Christmas?
Christmas Day is December 25. Use our live Days Until Christmas countdown to see the exact number of days remaining, updated every second — today is always shown in your local time zone.
How many days are there between two dates?
Enter any start and end date in our Days Between Dates calculator to get the exact number of days, including or excluding the end date. The calculation runs locally in your browser — no data is sent to a server.
How many days until New Year?
New Year's Day is January 1. Our Days Until New Year countdown shows the exact time remaining to January 1, counting down every second in your local time zone.
How many weeks are between two dates?
Use our Weeks Between Dates calculator to get the number of full weeks between any two dates, ideal for planning, pregnancy, projects, and deadlines.
Are these date calculators free and private?
Yes. All HowManyDays.app calculators are completely free with no limits. Every calculation happens locally in your browser — we never see, store, or transmit the dates you enter.