# Date and time calc

> Utility app for calculating date and time differences, additions, and subtractions. (iPhone/iPad app by Osamu Ishigami.)

- Source: https://appshunter.io/ios/app/date-and-time-calc/id949261920 (this page in markdown: same URL + `.md`)
- Developer: [Osamu Ishigami](https://appshunter.io/developer/901265058)
- Category: Utilities, Lifestyle
- Price: Free
- Age rating: 4+
- Requires: iOS 17.6 · 6 MB
- Languages: English, Japanese
- Released: 2014-12-13
- Data updated: 2026-07-23
- Monetization: ad-supported
- User reviews in markdown: https://appshunter.io/ios/app/date-and-time-calc/id949261920/reviews.md

## What is Date and time calc?

This is a convenient app that makes date and time calculations easy.
With simple operation, you can quickly perform the calculations you need.

# Features
- Date difference calculation
- Date addition and subtraction
- Time difference calculation
- Time addition and subtraction

## Key features

- Date difference calculation
- Date addition and subtraction
- Time difference calculation
- Time addition and subtraction

## Recent user reviews (10 of 13)

All indexed reviews: https://appshunter.io/ios/app/date-and-time-calc/id949261920/reviews.md

### 3/5 — 見やすいです

*2025-11-21, version 2.1*

使わせてもらってます。
扱い安く操作も簡単ではあるのですが、差し引きする日付を数百日ともなるとプラスボタンを押し続けるのは非常に時間がかかります。
　是非ワンプッシュまたは長押しなど直接入力できるウインドウがほしいです。是非ともよろしくお願いします。

### 1/5 — 時間が表示されない

*2025-04-03, version 2.1*

どの時刻に設定しているか分からないから微妙

### 1/5 — 使えない

*2021-11-12, version 1.7*

計算したいのに画面真っ白けで
時間の選択すら出来ない。。。

### 1/5 — 画面からはみ出る

*2021-08-13, version 1.7*

アップデートしたら画面表示がおかしくなりました。画面より大きい。

### 1/5 — 時間が表示されません

*2021-02-13, version 1.6*

時間差計算の数字が表示されないです

### 1/5 — 表示されない

*2020-11-08, version 1.6*

時間表示されない。
バグ？

### 1/5 — バグ？

*2020-07-23, version 1.6*

計算しようにも肝心の情報を入力できないから計算がそもそもできない。

### 1/5 — 計算が違う！

*2019-10-11, version 1.4*

日付の計算してみて！答えが違う！

### 5/5 — 使いやすい

*2018-09-29, version 1.3*

大変使いやすいです。  アプリ内課金で広告を消けせないでしょうか？検討ください

### 1/5 — 和暦の判定に不備

*2018-03-08, version 1.1*

大正と平成など、元号をまたぐ計算ができないようです。西暦仕様に変更すれば、元号改定も乗り切れるのでは。

## Frequently asked questions about Date and time calc

### What can Date and time calc do?

Date and time calc allows you to calculate the difference between two dates, add or subtract days from a date, and perform similar calculations with time intervals.

### Is Date and time calc free to use?

Yes, Date and time calc is available for free. However, it does contain advertisements.

### What devices does Date and time calc support?

Date and time calc is designed for iPhone and iPod devices.

### How often is Date and time calc updated?

The latest version, 3.0, was released on 2026-06-18, indicating recent development activity.

### What is the age rating for Date and time calc?

Date and time calc has an age rating of 4+, making it suitable for a wide range of users.

### Does Date and time calc have ads?

Yes, Date and time calc contains advertisements as part of its free offering.

### When was Date and time calc first released?

Date and time calc was initially released on 2014-12-13.

## Version history (last 5 releases)

### 3.1 — 2026-07-20

In this version, only the age rating displayed on the App Store has been changed; the app itself remains unmodified.

### 3.0 — 2026-06-18

- Layout design has been changed.
- English language support has been added.
- Dark mode support has been added.

### 2.2 — 2026-05-17

iPhone16とiPhone17に対応しました。

### 2.1 — 2024-09-22

軽微なバグの修正をしました。

### 1.8 — 2022-11-24

iPhone 14 に対応しました。

## Apps similar to Date and time calc

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Time Calculator: Add, Subtract](https://appshunter.io/ios/app/time-calculator-add-subtract/id1583726955) | 4.6 (165) | Free | Utilities |
| [履歴書年号](https://appshunter.io/ios/app/id463157000) | — | Free | Utilities |
| [Number of Days Calculator](https://appshunter.io/ios/app/number-of-days-calculator/id1520146539) | — | Free | Utilities |
| [Date & Time Calculator Counter](https://appshunter.io/ios/app/date-and-time-calculator-counter/id1547673028) | 4.5 (21) | Free | Utilities |
| [Date and Time Checker](https://appshunter.io/ios/app/date-and-time-checker/id1495935338) | 5.0 (1) | Free | Utilities |
| [Time Duration/Add Calculator](https://appshunter.io/ios/app/time-durationadd-calculator/id1521417824) | — | Free | Utilities |

## More apps by Osamu Ishigami

- [Basic Calc Plus](https://appshunter.io/ios/app/basic-calc-plus/id926102502)
- [簡単割引計算](https://appshunter.io/ios/app/id933526428)
- [シンプル割り勘計算](https://appshunter.io/ios/app/id995617087)
- [cooking timer +](https://appshunter.io/ios/app/cooking-timer-plus/id1017297356)
- [まるばつ(３ならべ)](https://appshunter.io/ios/app/id1032911604)

All apps by Osamu Ishigami: https://appshunter.io/developer/901265058

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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 2026-07-23.*