# Date.Time Calculator vs QiMenChart

The clearest difference is price: Date.Time Calculator at $0.99 against QiMenChart's $6.99. On review sentiment, update cadence, ads and in-app purchases there is nothing between them.

Date.Time Calculator costs $0.99 and QiMenChart $6.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Date.Time Calculator ships an update every 5 months, QiMenChart every 6 months. The most recent releases landed on September 9, 2026 and June 11, 2026 respectively.

## The numbers

| Metric | Date.Time Calculator | QiMenChart |
| --- | --- | --- |
| Price | **$0.99** | $6.99 |
| Positive reviews | 0.0% of reviews | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 months** | Every 6 months |
| Monetization | Paid | Paid |
| Size | 1 MB | 6 MB |
| Requires iOS | 15.6 | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Noriaki HASHIBA](https://appshunter.io/developer/978336077) | [LAY KHIM TAN](https://appshunter.io/developer/738497892) |

## What reviewers say

### Date.Time Calculator

[App page](https://appshunter.io/ios/app/datetime-calculator/id978336078)

Calculate date and time differences, intervals, and perform unit conversions with a pure calculator interface. Useful for determining future or past dates, calculating total time for multiple events, and converting between various time units and POSIX time.

**Highlights:** Date and time point calculations, Time interval calculations, Unit conversion of time, POSIX time interconversion, Time zone mutual conversion, Arithmetic operations with time

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### QiMenChart

[App page](https://appshunter.io/ios/app/qimenchart/id1028901400)

This app generates historical charts for years, months, days, and hours using traditional Chinese calendrical methods. It allows users to orient the chart with a compass based on their position. The application focuses solely on chart plotting without providing any analysis or user settings.

**Highlights:** Plot Year, Month, Day, Hour Charts, Chai Bu and Zhi Run Methods, Year Range 1800-9999, Compass Orientation, Chart Plotting Only

**In-app purchases:** none


## Frequently asked questions

### Is Date.Time Calculator free?

Date.Time Calculator costs $0.99, with no in-app purchases.

### Is QiMenChart free?

QiMenChart costs $6.99, with no in-app purchases.

### Do Date.Time Calculator or QiMenChart have ads?

Neither Date.Time Calculator nor QiMenChart shows ads.

### Which is updated more often, Date.Time Calculator or QiMenChart?

Date.Time Calculator ships an update every 5 months, and QiMenChart every 6 months. Most recently, Date.Time Calculator was updated on September 9, 2026 and QiMenChart on June 11, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*