# C-5 Duty Day Calc

> C-5 duty day calculator for military aircrews with time zone restrictions. (iPhone/iPad app by John Robbins.)

- Source: https://appshunter.io/ios/app/c-5-duty-day-calc/id998041462 (this page in markdown: same URL + `.md`)
- Developer: [John Robbins](https://appshunter.io/developer/831427516)
- Category: Travel, Utilities
- Price: $0.99
- Rating: 5.00/5 from 1 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.0 · 1 MB
- Languages: American English
- Released: 2015-06-23
- Data updated: 2026-08-23
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/c-5-duty-day-calc/id998041462/reviews.md

## What is C?

A C-5 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. 

NEW: 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
- Customizable timeline tool
- Time calculator
- 781 decimal duration support

## Chart rankings

- #197 in Top Paid · Travel (US App Store)

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/c-5-duty-day-calc/id998041462/reviews.md

### 5/5 — Suggestion

*2019-10-20*

Great app. Only thing I noticed is that you cannot put hours and minutes in the Zulu conversion time. 
Example: Bagram is 4+30 Zulu.

## Frequently asked questions about C

### What is C-5 Duty Day Calc?

C-5 Duty Day Calc is a paid application designed to help C-5 aircrews calculate duty day restrictions across different time zones. It simplifies complex calculations for flight planning.

### Does C-5 Duty Day Calc have ads?

No, C-5 Duty Day Calc does not contain advertisements. It is a paid application that offers an ad-free experience for its users.

### What devices support C-5 Duty Day Calc?

C-5 Duty Day Calc is available for iPhone, iPad, and iPod devices. It is designed for Apple's mobile operating system.

### How often is C-5 Duty Day Calc updated?

The latest version, 2.1, was released on January 26, 2023. Updates generally focus on improving functionality and addressing user feedback.

### What is the age rating for C-5 Duty Day Calc?

C-5 Duty Day Calc has an age rating of 4+. This indicates it is suitable for a wide range of users, including younger individuals.

### Can I add my own timelines to C-5 Duty Day Calc?

Yes, the latest update allows you to add your personal or squadron timeline to the app. This custom timeline can be linked to calculator pages or used independently for planning.

### What kind of time calculations does C-5 Duty Day Calc offer?

It includes a time calculator that can determine start time, duration, or end time when the other two are provided. It also supports the 781 decimal duration format.

### What is the user sentiment for C-5 Duty Day Calc?

Based on available data, C-5 Duty Day Calc has a perfect rating of 5.0 stars from 1 rating, suggesting a highly positive user experience.

## Version history (last 4 releases)

### 2.1 — 2023-01-26

Fixed strange little night shift bug on the Bravo Tab.  
(I'm sorry Dave that you were stuck in Bravo.)

### 2.0 — 2022-04-29

Cleaned up the interface.

### 1.4 — 2019-04-07

Fixed errors on Augmented Duty Day pre alert not calculating as well as minor cosmetic fixes.
Thanks for supporting the project. 
Fly Safe!

### 1.2 — 2015-06-23

No release notes.

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| --- | --- | --- | --- |
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| [Worldwide Per Diem](https://appshunter.io/ios/app/worldwide-per-diem/id1526410301) | 4.0 (25) | Free | Travel |
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| [World Clock Time Zone Widgets](https://appshunter.io/ios/app/world-clock-time-zone-widgets/id956377119) | 4.7 (22,093) | Free | Travel |

## More apps by John Robbins

- [C-17 Duty Day Calc](https://appshunter.io/ios/app/c-17-duty-day-calc/id831427512)
- [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)

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

## Related topics

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

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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 2026-08-23.*