# Number of Days Calculator — Calculate number of days, date

> Calculate number of days, date (iPhone/iPad app by Kouji Yamauchi.)

- Source: https://appshunter.io/ios/app/number-of-days-calculator/id1520146539 (this page in markdown: same URL + `.md`)
- Developer: [Kouji Yamauchi](https://appshunter.io/developer/1519365107)
- Category: Utilities, Productivity
- Price: Free
- Age rating: 4+
- Requires: iOS 13.0 · 17 MB
- Languages: English, Japanese, Korean, Chinese, Spanish, Chinese
- Released: 2020-06-25
- Data updated: 2026-05-14
- User reviews in markdown: https://appshunter.io/ios/app/number-of-days-calculator/id1520146539/reviews.md

## What is Number of Days Calculator?

Day Calculator is an app that allows you to easily calculate dates and days.
You can easily check dates such as anniversaries because you can calculate the number of days from the date or the date from the number of days.
You can also specify whether to include the start date or not.

・Calculate the number of days from a date
You can calculate the number of days between start and end dates. In addition to notation by year, month and day, it is also displayed by month and day, or day only.

・Calculate date by date + number of days
You can easily see the date after a certain number of days from the start date and number of days.

・Calculate date with date - number of days
From the start date and number of days, you can easily check the previous date for that number of days.

・ Calculate the number of days from today on X day
If you enter the date, you can check how many days from today that date is. It is also displayed in year, month, day, month and day, or day only.

・Calculate how many days ago from today
If you enter the date, you can check how many days ago that day is from today. It is also displayed in year, month, day, month and day, or day only.


## Version history (last 5 releases)

### 1.5 — 2024-02-15

Bug fix

### 1.4 — 2023-03-22

You can now set today's date.

### 1.3 — 2023-01-14

Bug fix

### 1.2 — 2022-05-19

No release notes.

### 1.1 — 2021-08-06

No release notes.

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## More apps by Kouji Yamauchi

- [Age Calculator Simple](https://appshunter.io/ios/app/age-calculator-simple/id1519365105)
- [Time Duration/Add Calculator](https://appshunter.io/ios/app/time-durationadd-calculator/id1521417824)
- [Simple Discount Calculator](https://appshunter.io/ios/app/simple-discount-calculator/id1522660327)
- [Per Gram Calculator](https://appshunter.io/ios/app/per-gram-calculator/id1523612245)
- [Easy Dice Roll](https://appshunter.io/ios/app/easy-dice-roll/id1523770757)

All apps by Kouji Yamauchi: https://appshunter.io/developer/1519365107

## Related topics

[date calendar calculator](https://appshunter.io/ios/topics/date-calendar-calculator) · [days elapsed](https://appshunter.io/ios/topics/days-elapsed) · [longer days](https://appshunter.io/ios/topics/longer-days)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-05-14.*