# Old Japanese Clock — Life with Various Hour Systems

> Converts modern time to historical Japanese fixed and temporal hour systems. (iPhone/iPad app by Takafumi AMANO.)

- Source: https://appshunter.io/ios/app/old-japanese-clock/id852909242 (this page in markdown: same URL + `.md`)
- Developer: [Takafumi AMANO](https://appshunter.io/developer/581065340)
- Category: Lifestyle, Education
- Price: $3.99
- Rating: 5.00/5 from 1 App Store ratings · 7 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.0 · 9 MB
- Languages: American English, Japanese
- Released: 2014-04-18
- Data updated: 2026-08-24
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/old-japanese-clock/id852909242/reviews.md

## What is Old Japanese Clock?

This app serves as a time converter between the current hour system and old Japanese hour systems. It offers two options: a fixed hour system and a temporal hour system.

The fixed hour system includes six different types: Engishiki, Guchureki, Semmyoreki, Semi-Engishiki, Kanagoyomi, and Shichiyoreki. These systems were primarily used from the Nara era through to the Edo era (c. 710–1872).

On the other hand, the temporal hour system encompasses seven types: Temporeki, Koten, Shaku-Sun-Bu (Class 1 and 2), and Three-Divided (Class 1 to 3). These were predominantly used during the late Edo era (1844–1872).

This app proves invaluable when reading Japanese historical documents, adjusting Japanese clocks (Wadokei), or recreating the lifestyle of ninjas and samurais, among other apps. For more detailed information, please visit the developer's website.

■ Exemption from Liability

ASTI shall not be held responsible for any consequences arising from the use of this app. We disclaim all liability for any potential damages, injuries, or losses resulting from app usage.

## Key features

- Converts between modern and old Japanese time
- Fixed hour system with six types
- Temporal hour system with seven types
- Supports Engishiki, Guchureki, and more
- Useful for historical document analysis
- Aids in adjusting Japanese clocks (Wadokei)

## Recent user reviews (7 of 7)

All indexed reviews: https://appshunter.io/ios/app/old-japanese-clock/id852909242/reviews.md

### 1/5 — 余計なことしないでください

*2025-11-13*

地図から緯度経度をノルウェー北部にしたところ、起動すらせずにクラッシュして使えません！
緯度経度の正当処理やチェックができないのなら、機能廃止してください！
まったく使い物になりません！
更新する毎、改悪過ぎです！！！

**Developer response:** （追記10/9）7/3公開バージョン（v1.9.7）以降は一括換算も高緯度対応していますのでお試しください。（初回7/2）一括換算使用時に高緯度（夜明け・日暮れがない場所）でも強制終了しないバージョンを申請中ですのでしばらくお待ちください。

### 4/5 — フォントが・・・

*2020-11-30*

（更新）
和風のフォントを選んで表示できると良いのですが。

**Developer response:** （追記10/22）「明朝体」スイッチをオンにしてください。和風か否かについて議論の余地はあります。

（初回20/11/30）「イケてる」の意味がよく分かりません。具体的に記していただくと対応が迅速かつ容易になります。できればサポートにメールいただければと思います。

### 1/5 — Chime doesn’t work properly!

*2020-06-20*

Chime doesn’t work properly. If it’s 0 or 12 o’clock, it dings 9 times properly. But it dings only 4 times for all the other times. I live in U.K. and set my location in U.K. properly in your map setting or local time. If it’s a bug, please fix ASAP!

**Developer response:** This app uses old Japanese time systems in the Edo era. If you use fixed hour systems, temple bell rings 9 times at 11 a.m. and 11 p.m., 8 times at 1 a.m. and 1 p.m., 7 times at 3 a.m. and 3 p.m., 6 times at 5 a.m. and 5 p.m., 5 times at 7 a.m. and 7 p.m., 4 times at 9 a.m. and 9 p.m. Please check “Hour Systems Info”.

### 5/5 — 時代劇には必需品

*2020-04-14*

歴史物には時刻が欠かせない。丑三つ時 時そば 鬼平犯科帳 遡って平将門 時刻が分からないと 理解出来ない。月齢と時刻 すべて歩いていた時代 月明かりが無ければ 夜這いも出来ない。

### 4/5 — ユーザインタフェースの問題点

*2017-10-27*

1. 時刻制度より下のメニューが表示されない。
iPhone/iPodでは一度時刻の換算・逆換算を実行すると表示されるようになるが、マルチタスクからアプリを終了した後再度実行すると不表示に戻る。
iPadでは上記を行なっても表示されない。
2. iPhone4Sでは時の鐘の入切選択が最下段のメニューと重なってしまいアクセス出来ない。

追記
1.9.2で上記1.は改善されたが2.はまだ直っていない。

**Developer response:** （2018/7/28追記）ご迷惑おかけしております。他の利用者さまからメニューと重なる件についてメール及びスクリーンショットを頂き，症状について確認しました。今更ながら修正版を申請中ですのでお待ちください。
（2017/10/27初回）iPhone 4Sでは公開当初より時の鐘の機能はありません。項目も重なっているのではなく，もともと表示されておりません。申し訳ありませんが，iPhone 5以降を使用していただければと思います。

### 5/5 — 有難う御座います！

*2016-06-01*

時の鐘の偶数選択が出来る様になったので、助かりました！
有難う御座いました！

### 1/5 — 鐘の音

*2014-06-23*

鳴らないんですけど

## Frequently asked questions about Old Japanese Clock

### What is the Old Japanese Clock app?

Old Japanese Clock is a paid application that converts modern time into various historical Japanese hour systems, including fixed and temporal types used from the Nara to Edo eras.

### How much does the Old Japanese Clock app cost?

The Old Japanese Clock app is a paid application priced at $3.99.

### What historical Japanese hour systems does Old Japanese Clock support?

It supports six fixed hour systems (Engishiki, Guchureki, Semmyoreki, Semi-Engishiki, Kanagoyomi, and Shichiyoreki) and seven temporal hour systems (Temporeki, Koten, Shaku-Sun-Bu, and Three-Divided classes).

### What devices is Old Japanese Clock compatible with?

Old Japanese Clock is compatible with iPhone, iPad, and iPod devices.

### Is Old Japanese Clock suitable for children?

The app has an age rating of 4+, indicating it is suitable for young users.

### How often is Old Japanese Clock updated?

The app was last updated on December 19, 2025, with version 1.13.3, suggesting regular maintenance and updates.

### Does Old Japanese Clock have ads?

No, Old Japanese Clock does not contain advertisements. It is a paid application without ads.

### What is the user rating for Old Japanese Clock?

The app has a perfect rating of 5.0 stars based on one user review.

## Version history (last 5 releases)

### 1.13.3 — 2025-12-19

- Fixed bugs.

### 1.13.2 — 2025-12-12

- Fixed bugs.

### 1.13.1 — 2025-11-13

- Fixed bugs.

### 1.13 — 2025-11-12

- Supported iOS 26.

### 1.12 — 2025-04-28

- Improved UI.
- Fixed bugs.

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## More apps by Takafumi AMANO

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All apps by Takafumi AMANO: https://appshunter.io/developer/581065340

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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 2026-08-24.*