Hroice duration calculator

Heroic Entertainment

About this app

Your visa expires in 90 days. Your subscription renews in 30. Your contract deadline is the 15th of next month. Do you know the exact dates — and how many working days you actually have left?

Duration & Days Calculator does one thing and does it completely: precise date and time math, entirely on your device, with no internet connection required.

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TWO WAYS TO CALCULATE
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✦ Between Two Dates
Pick a start date and an end date. The app instantly breaks down the exact difference into every unit you might need — all displayed at once, with no switching between modes.

✦ Add or Subtract Time
Start from any date — or tap "Use Today" — and add or subtract any combination of years, months, weeks, days, hours, and minutes. The resulting date appears live as you adjust each field. Quick preset chips let you jump to +7 days, +30 days, +90 days, +1 year, and more in a single tap.

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EVERY NUMBER YOU NEED
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When you calculate between two dates, the app shows all of the following simultaneously — no need to recalculate for each unit:

→ Exact breakdown: years, months, and days
→ Total days
→ Total weeks and remaining days
→ Decimal months and decimal years
→ Total hours, minutes, and seconds
→ Business days (excluding weekends)
→ Weekend days
→ Day of the week for both dates
→ Whether the range includes a leap day

No other date calculator shows you this much in a single view.

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BUSINESS DAYS THAT MATCH YOUR WEEK
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Not everyone's working week runs Monday to Friday. In Settings, you choose exactly which days count as the weekend — so your business day counts are accurate whether you work a standard Western week, a Sunday–Thursday schedule, or anything in between.

You can also enable public holiday exclusion for 10 major regions (US, UK, France, Germany, Spain, India, Australia, Canada, Japan, Morocco). Holiday data is fully bundled — no download, no update, no connectivity needed. It covers 2020 through 2030.
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COUNTDOWN TRACKER
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Save named deadlines and watch them count down in real time. Colour-coded urgency badges tell you at a glance what needs attention:

🟢 More than 30 days — you have time
🟡 8 to 30 days — worth watching
🟠 1 to 7 days — act soon
🔴 Today — deadline is now
⚫ Past — how long ago it was

Perfect for visa expiry dates, subscription renewals, contract deadlines, permit applications, exam dates, or any fixed date that matters.
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CALCULATION HISTORY
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Every calculation is saved automatically. Tap any past entry to reload the exact inputs back into the calculator. Your history survives app restarts and is stored entirely on your device.

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WORKS COMPLETELY OFFLINE
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Duration & Days Calculator performs all calculations locally using your device's own clock and calendar. There are no servers, no sync, no account sign-in, and no permissions requested. It works on a plane, underground, or anywhere you need a reliable answer about a date.

PERFECT FOR

→ Travellers calculating visa run windows and permitted stay durations
→ Freelancers tracking invoice payment terms and project deadlines
→ Remote workers managing contract end dates and notice periods
→ Subscribers calculating when a free trial or billing cycle actually ends
→ Students and exam candidates counting down to important dates
→ HR and admin professionals calculating working days for leave and notice
→ Anyone who has ever Googled "how many days until" and wanted more than a single number

PERMISSIONS

None. Duration & Days Calculator requests zero device permissions.

Duration & Days Calculator is completely free, fully offline, and contains no advertisements.