# C-17 Duty Day Calc

> C-17 Duty Day Calculator for military aircrews. (iPhone/iPad app by John Robbins.)

- Source: https://appshunter.io/ios/app/c-17-duty-day-calc/id831427512 (this page in markdown: same URL + `.md`)
- Developer: [John Robbins](https://appshunter.io/developer/831427516)
- Category: Utilities, Travel
- Price: $0.99
- Rating: 4.20/5 from 13 App Store ratings · 8 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.0 · 3 MB
- Languages: American English
- Released: 2014-03-11
- Data updated: 2026-08-24
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/c-17-duty-day-calc/id831427512/reviews.md

## What is C?

A C-17 Duty Day Calculator for crews hauling Uncle Sam's stuff around the Globe. 

This app will quickly help you calculate all applicable duty day restrictions in both Zulu and Local time zones.  Simply enter the Alert, Show or Takeoff time and all Vol-3 restrictions will be instantly calculated for you.  No more complex calculus at the end of your duty day. 

BONUS: You can now add your own timeline to the app. Add your personal or squadron timeline to the latest addition. The tab can be tied to other calculator pages or work as a standalone tool for you planning your duty day. 

It also includes a time calculator that allows you to calculate start, duration or end time when given the other two. Including the 781 decimal duration.  

Hope you find it useful.  My email is included if you have suggestions for improvements.

## Key features

- Duty day restriction calculation
- Zulu and local time zone support
- Instant restriction calculation
- Custom timeline addition
- Time calculator (start, duration, end)
- 781 decimal duration support

## Chart rankings

- #150 in Top Paid · Utilities (US App Store)

## Recent user reviews (8 of 8)

All indexed reviews: https://appshunter.io/ios/app/c-17-duty-day-calc/id831427512/reviews.md

### 3/5 — Still same issue with font

*2024-08-10*

Decent app but some of the inputs are unreadable like another review said. Would be really helpful if this would be worked out.

### 5/5 — Great Calculator! So helpful

*2022-04-15*

Update: thanks for the quick fix! Wish we could get that hour back. The flying has been pretty great! Also, not sure if I did something to my settings, but the font is all white now and difficult to read. 

Love the calculator to help with everything we need to know. The only ask is that for bravo, “last beer” calculates wrong. It gives you 11 hours prior instead of 12. Would appreciate if you guys could update that so that it doesn’t get anybody in trouble after being tired and possibly not realizing the calculation is wrong. Otherwise, absolutely a great app!

**Developer response:** Thanks for pointing that out.  I just submitted an update to Apple.  Look for ver4.7 in the next couple days.  Hope you're flying some good trips.

### 4/5 — Awesome app but new version issue

*2022-04-15*

Awesome app, but the new update screws up the color scheme when using an iPhone with “Dark Mode” selected in phone settings under “Display and Brightness”. 

 Bravo is unreadable and just the input boxes are unreadable for the other pages but they are harder to read (white on light blue for airland). I think most people use dark mode these days so I’m sure I’m not the only one who would appreciate you looking into it. Thanks in advance!

### 4/5 — Keep up the great work!

*2021-10-26*

I really like the app a lot. Clean interface and easy to use.

One minor suggestion though: can you please make the “take off time local” block editable that way you can calculate everything based on local time?

**Developer response:** seoperator77,  you sound like a 89th pilot... those guys have been asking for that feature for a while.  I'm not sure when I'll be able to reopen the code and cut into it that deep, but I've got it on the list for the next major release.  Thanks for the suggestion!  -john

### 4/5 — A recommendation

*2016-01-31*

I really like the app, thanks for the work to make our lives easier on the road. One recommendation, "Time Calculator" - "Duration" needs to have a decimal point input capability. All the best! 
-Bill

### 5/5 — Great app! Love it! Must have for C-17 crews

*2015-11-13*

Makes everything super easy for anything flying related! My only suggestion would be a calculator for post mission crew rest. I know it's super easy to calculate, but just thought it would be something to add.

### 5/5 — Awesome Calculator

*2015-03-07*

Must need for any pilot. Is it possible to add an iOS 6 version?

### 5/5 — Great App !!

*2014-03-27*

Awesome app and it is well worth the money. Much better than others available on the market. I was glad to see the creation of this and patiently waited it's release.

## Frequently asked questions about C

### What is C-17 Duty Day Calc used for?

C-17 Duty Day Calc is a utility app designed to help C-17 aircrews quickly calculate applicable duty day restrictions in both Zulu and local time zones. It simplifies the process of determining these restrictions based on alert, show, or takeoff times.

### Does C-17 Duty Day Calc have ads?

No, C-17 Duty Day Calc does not contain advertisements. The app is ad-free, providing an uninterrupted user experience.

### What devices is C-17 Duty Day Calc compatible with?

C-17 Duty Day Calc is compatible with iPhone, iPad, and iPod devices. It supports a range of Apple mobile devices.

### How often is C-17 Duty Day Calc updated?

The latest version of C-17 Duty Day Calc is 4.25, last updated on April 16, 2022. While updates are not frequent, the app has been stable since its initial release in 2014.

### What is the age rating for C-17 Duty Day Calc?

C-17 Duty Day Calc has an age rating of 4+. This indicates it is suitable for a wide range of users.

### Can I add my own timelines to C-17 Duty Day Calc?

Yes, C-17 Duty Day Calc includes a bonus feature allowing you to add your personal or squadron timeline. This custom timeline can be linked to other calculator pages or used as a standalone planning tool.

### What is the price of C-17 Duty Day Calc?

C-17 Duty Day Calc is a paid application priced at $0.99. This one-time purchase grants you access to all its features.

### What kind of time calculations does C-17 Duty Day Calc offer?

Beyond duty day restrictions, C-17 Duty Day Calc includes a time calculator. This tool can determine start time, duration, or end time when the other two are provided, and it supports the 781 decimal duration format.

## Version history (last 5 releases)

### 4.25 — 2022-04-16

Fixed glitch with "night mode" causing text to turn white.

### 4.23 — 2022-04-15

Minor face lift and fixed "Bravo Beer" issue thanks to all those who pointed it out.  Wish I could give you the extra hour back.

### 4.21 — 2019-04-06

Minor changes to cleanup interface and update the application. 
Thanks everyone for supporting the project. 
Fly Safe

### 4.2 — 2019-03-22

Minor changes to cleanup interface and update the application. 
Thanks everyone for supporting the project. 
Fly Safe.

### 4.1 — 2015-06-20

App was given a face-lift and some of the internal calculations were optimized.

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## More apps by John Robbins

- [Post Msn Calc](https://appshunter.io/ios/app/post-msn-calc/id967104806)
- [KC-10 Duty Day Calculator](https://appshunter.io/ios/app/kc-10-duty-day-calculator/id986194211)
- [KC-135 Duty Day Calc](https://appshunter.io/ios/app/kc-135-duty-day-calc/id986551768)
- [C-130 Duty Day Calc](https://appshunter.io/ios/app/c-130-duty-day-calc/id994789492)
- [C-5 Duty Day Calc](https://appshunter.io/ios/app/c-5-duty-day-calc/id998041462)

All apps by John Robbins: https://appshunter.io/developer/831427516

## Related topics

[duty day](https://appshunter.io/ios/topics/duty-day)

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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.*