Updating
Description
Flight Day/Night Calculator is a precision offline tool for calculating exact day and night flight time. Built by an airline pilot for pilots at every stage, from first night cross-country to complex long-range operations at high latitudes, it delivers the accuracy and confidence your logbook demands.
Why This App?
Aviation authorities require accurate day and night flight time splits, but calculating them precisely is genuinely difficult without specialised tools. The sun’s position changes continuously along your route, and day/night boundaries shift with latitude, season, altitude, and groundspeed. Most pilots rely on rough estimates or extrapolate from departure and arrival sun events. Many logbook apps do the same, which leads to significant inaccuracies on longer flights or operations near the poles.
Flight Day/Night Calculator makes professional-grade accuracy simple. It performs minute-by-minute position tracking with embedded astronomy algorithms, working completely offline. No guesswork. No manual plotting. Just accurate results you can log with confidence.
How It Works
The app computes your aircraft’s position every minute using your departure, destination, and optional waypoints (up to 20). At each point it determines the sun’s elevation angle to classify day and night using internationally recognised civil twilight definitions.
You can optionally display nautical and astronomical twilight phases, and calculate sunrise and sunset at sea level or corrected for cruise altitude, without affecting regulatory day/night totals.
The History view stores the export text for your most recent flights, allowing quick reference to previously calculated results exactly as generated.
Location Lookup
Search any airport or position and instantly view sunrise, sunset, morning civil twilight (MCT), evening civil twilight (ECT), and complete twilight information for any date.
Location Lookup also supports Custom Location entries for ad-hoc positions; these are lookup-only and do not replace airports in the main calculator.
This makes it ideal for pre-flight planning, sun-event comparison, and validating conditions at both ends of your route, fully offline.
Key Features
- Direct ICAO entry with airport name confirmation, or full offline airport search
- Location Lookup with sunrise, sunset, MCT, ECT, and complete twilight information for any date
- Optional waypoints (up to 20) for realistic routing, or fast great-circle mode
- Block time (OOOI) or airborne-only calculations with accurate taxi handling
- Optional local time entry with manual UTC offset selection for predictable, DST-safe inputs
- Accurate worldwide day and night calculation using civil twilight definitions
- Optional nautical and astronomical twilight display
- Altitude-adjusted sunrise and sunset for cruise flight levels
- Customisable logbook notes included in exports
- History of recent flights, storing export text exactly as generated
- Results in both hours:minutes and decimal hours
- Detailed transition events with exact times and coordinates
- Distance and average groundspeed always displayed
- Input validation to prevent unrealistic or impossible entries
- Fully offline with no sign-in, no data collection, and no network requirements
- Optimised for iPhone and iPad with a clean pilot-focused design
- Full support for Light and Dark mode
Designed to Complement Your Logbook
Flight Day/Night Calculator works alongside your existing logbook or logbook app, providing reliable day and night splits you can trust. Whether you are building hours toward commercial ratings, maintaining night currency, or logging long-range international flights, this app helps you maintain the level of accuracy your logbook deserves.
What's New in Version v1.4
New and Improved:
• Location Lookup replaces the former Airport Lookup, better reflecting its expanded ability to look up sunrise, sunset, MCT, ECT, and twilight information for any airport or position.
• Support for Custom Airport entries in the main calculator, enabling accurate day/night calculations from ad-hoc positions not tied to the airport database.
• Support for Custom Location entries in Location Lookup for ad-hoc sunrise, sunset, and twilight planning, independent of the main calculator.
• Updated and expanded offline airport database, including additional metadata and improved handling of closed-flagged aerodromes.
• Refined day/night time rounding logic to ensure totals are internally consistent, auditable, and stable across edge cases such as twilight boundaries, near-midnight crossings, and long-haul segments. Displayed decimal hours now align exactly with the underlying minute-based calculations used for logbook accuracy.
• Improved handling of fractional minutes and segment boundaries to eliminate cumulative rounding drift between leg totals, summaries, and exported results.
• App icon refreshed.
• Minor refinements to validation and guardrails to improve clarity, predictability, and user feedback.
• Various UI polish, naming consistency updates, and About screen editorial improvements.
As always, all calculations remain fully offline, UTC-authoritative, and produce consistent, repeatable results suitable for accurate logbook use.
Information
Developer
Categories
Version
v1.4
Size
55.4 MB
Game Center
No
VPP Device Licensing
Yes
Rating
Rated: 4+
Compatibility
iOS 16.0 or later
Devices
iPhone 5s, iPhone 6, iPhone 6 Plus, iPhone 6s, iPhone 6s Plus, iPhone SE, iPhone 7, iPhone 7 Plus, iPhone 8, iPhone 8 Plus, iPhone X, iPhone XR, iPhone XS, iPhone XS Max, iPhone 11, iPhone 11 Pro, iPhone 11 Pro Max, iPhone SE (2nd generation), iPhone 12, iPhone 12 Pro, iPhone 12 Pro Max, iPhone 12 mini, iPhone 13, iPhone 13 Pro, iPhone 13 Pro Max, iPhone 13 mini, iPhone SE (3rd generation), iPhone 14, iPhone 14 Plus, iPhone 14 Pro, iPhone 14 Pro Max, iPhone 15, iPhone 15 Plus, iPhone 15 Pro, iPhone 15 Pro Max, iPhone 16, iPhone 16 Plus, iPhone 16 Pro, iPhone 16 Pro Max, iPhone 16e, iPhone 17, iPhone 17Pro, iPhone 17ProMax, iPhone Air, iPad (5th Generation) Wi-Fi, iPad (5th Generation) Wi-Fi + Cellular, iPad (6th generation) Wi-Fi, iPad (6th generation) Wi-Fi + Cellular, iPad Pro, iPad Pro (Cellular), iPad Pro (9.7-inch), iPad Pro (9.7-inch) (Cellular), iPad Pro 12.9-inch (2nd generation), iPad Pro 12.9-inch (2nd generation) Wi-Fi + Cellular, iPad Pro (10.5-inch), iPad Pro (10.5-inch) Wi-Fi + Cellular, iPad Pro (11-inch), iPad Pro (11-inch) Wi-Fi + Cellular, iPad Pro 12.9-inch (3rd generation), iPad Pro 12.9-inch (3rd generation) Wi-Fi + Cellular, iPad Air, iPad Air (Cellular), iPad Air 2, iPad Air 2 (Cellular), iPad Air (3rd generation), iPad Air (3rd generation) Wi-Fi + Cellular, iPad mini Retina, iPad mini Retina (Cellular), iPad mini 3, iPad mini 3 (Cellular), iPad mini 4, iPad mini 4 (Cellular), iPad mini (5th Generation), iPad mini (5th Generation) Wi-Fi + Cellular, iPad (7th generation) Wi-Fi + Cellular, iPad Pro 11-inch (2nd generation), iPad Pro 11-inch (2nd generation) Wi-Fi + Cellular, iPad Pro 12.9-inch (4th generation), iPad Pro 12.9-inch (4th generation) Wi-Fi + Cellular, iPad Air (4th Generation) (Wi-Fi), iPad Air (4th Generation) (Wi-Fi + Cellular), iPad (8th generation) Wi-Fi, iPad (8th generation) Wi-Fi + Cellular, iPad Pro 11-inch (3rd generation), iPad Pro 11-inch (3rd generation) Wi-Fi + Cellular, iPad Pro 12.9-inch (5th Generation), iPad Pro 12.9-inch (5th Generation) Wi-Fi + Cellular, iPad (9th Generation), iPad (9th Generation) Wi-Fi + Cellular, iPad mini (6th Generation), iPad mini (6th Generation) Wi-Fi + Cellular, iPad Air (5th generation), iPad Air (5th generation) Wi-Fi + Cellular, iPad Pro 11-inch (4th generation), iPad Pro 11-inch (4th generation) Wi-Fi + Cellular, iPad Pro 12.9-inch (6th generation), iPad Pro 12.9-inch (6th generation) Wi-Fi + Cellular, iPad (10th generation), iPad (10th generation) Wi-Fi + Cellular, iPad Air 11-inch (M2) Wi-Fi, iPad Air 13-inch (M2) Wi-Fi, iPad Air 13-inch (M2) Wi-Fi + Cellular, iPad Pro 11-inch (M4) Wi-Fi, iPad Pro 11-inch (M4) Wi-Fi + Cellular, iPad Pro 13-inch (M4) Wi-Fi, iPad Pro 13-inch (M4) Wi-Fi + Cellular, iPad mini (A17 Pro) Wi-Fi, iPad mini (A17 Pro) Wi-Fi + Cellular, iPad (A16) Wi-Fi, iPad (A16) Wi-Fi + Cellular, iPad Air 11-inch (M3) Wi-Fi, iPad Air 11-inch (M3) Wi-Fi + Cellular, iPad Air 13-inch (M3) Wi-Fi, iPad Air 13-inch (M3) Wi-Fi + Cellular, iPad Pro11M5, iPad Pro11M5Cellular, iPad Pro13M5, iPad Pro13M5Cellular, iPod touch (6th Generation), iPod touch (7th generation)
Languages
English
App Store: Customer Ratings
Ratings & Reviews
0.0 of 5 (No rating)
App Store: Customer Reviews
No Entry