# World Time Calc-Time converter — sunset,sunrise,work hour clock

> World clock with day/night and work hour visualization and notifications. (iPhone/iPad app by Hajime Suzuki.)

- Source: https://appshunter.io/ios/app/world-time-calc-time-converter/id6472414655 (this page in markdown: same URL + `.md`)
- Developer: [Hajime Suzuki](https://appshunter.io/developer/1615906018)
- Category: Lifestyle, Utilities
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 16.0 · 10 MB
- Languages: English, Japanese
- Released: 2023-11-22
- Data updated: 2026-07-09
- Monetization: ad-supported
- User reviews in markdown: https://appshunter.io/ios/app/world-time-calc-time-converter/id6472414655/reviews.md

## What is World Time Calc?

・Features of the WorldTimeCalc
・Graph of day/night and working hours in each city. - Day and night time will be updated automatically every day. Working hours can be changed manually for each city.
・By sliding the cursor, the time for each city will change in the list.
・In normal times, the cursor points to the current time in real time, so you can see at a glance whether it is daytime, nighttime, during business hours, or outside in each city.
・You can send alarm notifications for sunrise, sunset, start time, and end time.

## Key features

- Day/night and working hour graphs
- Automatic time updates
- Manual work hour adjustment
- Interactive time cursor
- Sunrise/sunset alarm notifications

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| PremiumPlan | $7.99 | one-time |


## Recent user reviews (3 of 3)

All indexed reviews: https://appshunter.io/ios/app/world-time-calc-time-converter/id6472414655/reviews.md

### 2/5 — 始業・終業時間の変更ができない！

*2024-09-19, version 1.0.4*

始業・終業時間の変更ができません。タップしてドラム状の変更できそうな画面はでるが、変更しようとそのドラム画面を更にタップすると元の画面に戻ってしまう。ここの不具合をすぐ解決してほしい。

### 5/5 — Very good App

*2024-05-20*

Works well. Nice layout.

### 5/5 — ミーティングの時間決めに悩まない

*2023-12-01, version 1.0.2*

昼夜、業務時間がグラフ化されているので、海外とのやりとりの時間設定するときに相手の日時が視覚的に把握できるのでとても便利です。 重宝しています！

## Frequently asked questions about World Time Calc

### What is World Time Calc?

World Time Calc is a time converter app that visualizes day/night cycles and working hours across different cities. It offers automatic time updates and customizable alarm notifications for sunrise and sunset.

### Can I manually adjust working hours in World Time Calc?

Yes, you can manually adjust the working hours for each city within World Time Calc. This allows for precise scheduling and visualization of business hours regardless of standard times.

### Does World Time Calc have ads?

Yes, World Time Calc contains advertisements. As a free application, ads are displayed to support its development and maintenance.

### What devices is World Time Calc available on?

World Time Calc is available on iPhone and iPad devices. It is designed to function across the Apple ecosystem.

### How often is World Time Calc updated?

World Time Calc was last updated on September 24, 2025, with version 1.2.0. The release date was November 22, 2023, suggesting regular updates are provided by the developer.

### What is the age rating for World Time Calc?

World Time Calc has an age rating of 4+. This indicates it is suitable for users of all ages, with no mature content.

### Can World Time Calc notify me about sunrise and sunset?

Yes, World Time Calc allows you to send alarm notifications for sunrise, sunset, and your defined start and end times for working hours.

## Version history (last 5 releases)

### 1.3.0 — 2026-06-27

Added support for daylight saving time
Fixed minor bugs

### 1.2.0 — 2025-09-24

Added a premium plan.
- Alarms with city and date/time settings.
- Up to 30 cities can be added.
- Ad-free.
- Various bug fixes, including UI display issues.
Fixed display issues on iPad.

### 1.1.1 — 2025-07-19

-Fixed an issue where the input picker for working hours and alarms did not work properly on iOS18.

### 1.1.0 — 2025-06-30

・City list proofreading and additions
・Minor bug fixes

### 1.0.9 — 2025-03-22

・City list proofreading and additions
・Minor bug fixes

## Apps similar to World Time Calc

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Time Zone Shifter](https://appshunter.io/ios/app/time-zone-shifter/id1484958175) | 3.7 (9) | Free | Lifestyle |
| [World Time Clock-Weather & Map](https://appshunter.io/ios/app/world-time-clock-weather-and-map/id6469668390) | 2.5 (4) | Free | Lifestyle |
| [Until24 -Show time remaining](https://appshunter.io/ios/app/until24-show-time-remaining/id6748893656) | — | Free | Lifestyle |
| [Timelook 24-hour Pie Chart](https://appshunter.io/ios/app/timelook-24-hour-pie-chart/id6581484248) | 5.0 (1) | Free | Lifestyle |
| [時間録り](https://appshunter.io/ios/app/id1616861120) | — | Free | Lifestyle |
| [MyShiftCalendar](https://appshunter.io/ios/app/myshiftcalendar/id537026979) | 4.8 (159) | Free | Lifestyle |

## More apps by Hajime Suzuki

- [ExTimer:Interval timer/hiit](https://appshunter.io/ios/app/extimerinterval-timerhiit/id1621046444)
- [SClock-large,high visibility](https://appshunter.io/ios/app/sclock-largehigh-visibility/id1633448389)
- [iNote:Color sticky note memo](https://appshunter.io/ios/app/inotecolor-sticky-note-memo/id1663710783)
- [World Time Clock-Weather & Map](https://appshunter.io/ios/app/world-time-clock-weather-and-map/id6469668390)
- [MoonScope](https://appshunter.io/ios/app/moonscope/id6747671746)

All apps by Hajime Suzuki: https://appshunter.io/developer/1615906018

## Related topics

[hajime suzuki](https://appshunter.io/ios/topics/hajime-suzuki)

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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 2026-07-09.*