# Date.Time Calculator vs Impact!

The clearest difference is price: Impact! at Free against Date.Time Calculator's $0.99. Impact! also leads on update cadence (fortnightly vs every 5 months). Date.Time Calculator's advantage is in-app purchases (none vs 1) and iOS requirement (15.6 vs 26.0). On ads and device support there is nothing between them.

Impact! is free to download; Date.Time Calculator costs $0.99 up front. Impact! sells 1 one-off in-app purchase. Date.Time Calculator asks for nothing beyond the download.

Date.Time Calculator ships an update every 5 months, Impact! fortnightly. The most recent releases landed on October 13, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Date.Time Calculator | Impact! |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Fortnightly** |
| Monetization | Paid | — |
| Size | 1 MB | 13 MB |
| Requires iOS | **15.6** | 26.0 |
| Devices | iPhone, iPod | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 17+ |
| Developer | [Noriaki HASHIBA](https://appshunter.io/developer/978336077) | [Audun Kjelstrup](https://appshunter.io/developer/989920958) |

## 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


### Impact!

[App page](https://appshunter.io/ios/app/impact-ballistic-calculator/id6476831891)

**Features:** Apple Watch app

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Impact! Pro | $14.99 | one-time |


## Frequently asked questions

### Is Date.Time Calculator free?

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

### Is Impact! free?

Impact! is free to download, with in-app purchases available.

### Do Date.Time Calculator or Impact! have ads?

Neither Date.Time Calculator nor Impact! shows ads.

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

Date.Time Calculator ships an update every 5 months, and Impact! fortnightly. Most recently, Date.Time Calculator was updated on October 13, 2026 and Impact! on October 30, 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.*