--- title: "C-5 Duty Day Calc — App Overview" url: https://marlvel.ai/apps/c5ddc category: Travel developer: John Robbins platforms: ios rating: 5.0 (1 ratings) pricing: paid report_level: overview generated: 2026-04-24 last_verified: "2026-04-24T06:53:18.280Z" --- > **Key Insight:** This app serves as a niche productivity tool for C-5 crews to eliminate manual calculation errors when determining duty day limitations. | Metric | Value | |--------|-------| | Category | Travel | | Rating | 5.0 ★ (1) | | Pricing | paid | | Platforms | iOS | | Latest Version (iOS) | 2.1 | | Developer | John Robbins | ## What is C-5 Duty Day Calc? C-5 Duty Day Calc is a specialized utility designed to automate complex duty day restriction calculations for C-5 aircrews. It streamlines mission planning by providing instant Vol-3 restriction outputs based on Alert, Show, or Takeoff times in both Zulu and Local time zones. ## Key Features - **Vol-3 Restriction Calculator**: Automatically calculates duty day restrictions based on user-inputted Alert, Show, or Takeoff times. - **Custom Timeline Builder**: Allows users to create and integrate personal or squadron-specific timelines into their duty day planning. - **Time Duration Calculator**: Computes start, duration, or end times, including support for 781 decimal duration formats. - **Multi-Zone Support**: Provides restriction calculations across both Zulu and Local time zones. ## Who is it for? C-5 aircrew members and mission planners requiring rapid duty day compliance calculations. ## Links - [App Store](https://apps.apple.com/us/app/c-5-duty-day-calc/id998041462?uo=2) - [Full Intelligence Report](https://marlvel.ai/apps/c5ddc) --- *This is an overview report. Sentiment analysis, competitive landscape, and SWOT analysis are available in the [full intelligence report](https://marlvel.ai/apps/c5ddc).* *Generated by [Marlvel.ai](https://marlvel.ai) — Independent app intelligence.*