the_paragliding_app

Timestamp Handling

IGC File Processing

• B Records: IGC B records contain UTC time (HHMMSS format) according to IGC specification
• Timezone Detection: Timezone is automatically detected from GPS coordinates of the first track point
• Midnight Crossing: The parser detects when a flight crosses midnight by checking if timestamps go backwards (e.g., 23:59 → 00:01) and automatically increments the date
• Conversion Flow:
  1. Parse B records as UTC timestamps
  2. Detect timezone from GPS coordinates
  3. Convert all timestamps from UTC to local time in bulk
  4. Validate timestamps are in chronological order

Display

• Local Time: All timestamps are displayed in the local timezone of the launch location
• Database Storage: Stores date (ISO8601), launch/landing times (HH:MM strings), and timezone offset
• Cesium 3D: Receives ISO8601 timestamps with timezone offset (e.g., “2025-07-11T11:03:56.000+02:00”)
• Flutter UI: Displays times in HH:MM format with optional timezone indicator

Key Services

• timezone_service.dart - Timezone detection and conversion
• igc_parser.dart - Handles UTC time parsing and midnight crossing detection
• Automatic timezone detection from GPS coordinates ensures correct local time display