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| from datetime import datetime, time, timedelta | |
| def _eastern_utc_offset(now_utc): | |
| """ | |
| Returns the UTC offset in hours for Eastern time (EST=-5, EDT=-4). | |
| Uses North American DST rules: starts second Sunday in March at 2 AM EST (07:00 UTC), | |
| ends first Sunday in November at 2 AM EDT (06:00 UTC). | |
| """ | |
| year = now_utc.year | |
| from datetime import timezone | |
| march_1 = datetime(year, 3, 1, tzinfo=timezone.utc) | |
| first_sun_mar = march_1 + timedelta(days=(6 - march_1.weekday()) % 7) | |
| dst_start = first_sun_mar + timedelta(weeks=1, hours=7) | |
| nov_1 = datetime(year, 11, 1, tzinfo=timezone.utc) | |
| first_sun_nov = nov_1 + timedelta(days=(6 - nov_1.weekday()) % 7) | |
| dst_end = first_sun_nov + timedelta(hours=6) | |
| if dst_start <= now_utc < dst_end: | |
| return 4 # EDT | |
| return 5 # EST | |
| def hms_to_seconds(hms_str): | |
| """Converts GTFS 'HH:MM:SS' (e.g. '25:30:00') to total seconds from midnight.""" | |
| h, m, s = map(int, hms_str.split(':')) | |
| return (h * 3600) + (m * 60) + s | |
| def get_service_day_start_ts(): | |
| """ | |
| Returns the Unix timestamp (UTC) for 00:00:00 of the CURRENT service day. | |
| TTC service day flips at 4:00 AM Eastern time (handles DST automatically). | |
| All timestamps are in UTC to match GTFS Realtime timestamps. | |
| """ | |
| from datetime import timezone | |
| try: | |
| # Python 3.9+ has zoneinfo built-in | |
| from zoneinfo import ZoneInfo | |
| eastern_tz = ZoneInfo("America/Toronto") | |
| except ImportError: | |
| # Fallback for older Python versions - use pytz if available | |
| try: | |
| import pytz | |
| eastern_tz = pytz.timezone("America/Toronto") | |
| except ImportError: | |
| # Last resort: pure-Python DST-aware Eastern offset | |
| now_utc = datetime.now(timezone.utc) | |
| utc_offset = _eastern_utc_offset(now_utc) | |
| if now_utc.hour < (4 + utc_offset): # 4 AM Eastern in UTC | |
| service_date = now_utc.date() - timedelta(days=1) | |
| else: | |
| service_date = now_utc.date() | |
| service_start_utc = datetime.combine(service_date, time.min, tzinfo=timezone.utc) + timedelta(hours=utc_offset) | |
| return int(service_start_utc.timestamp()) | |
| # Get current UTC time and convert to Eastern | |
| now_utc = datetime.now(timezone.utc) | |
| now_eastern = now_utc.astimezone(eastern_tz) | |
| # TTC service day flips at 4:00 AM Eastern | |
| if now_eastern.hour < 4: | |
| service_date = now_eastern.date() - timedelta(days=1) | |
| else: | |
| service_date = now_eastern.date() | |
| # Create datetime at 00:00:00 Eastern, convert to UTC | |
| try: | |
| # zoneinfo (Python 3.9+) | |
| service_start_eastern = datetime.combine(service_date, time.min, tzinfo=eastern_tz) | |
| except TypeError: | |
| # pytz needs localize | |
| service_start_eastern = eastern_tz.localize(datetime.combine(service_date, time.min)) | |
| service_start_utc = service_start_eastern.astimezone(timezone.utc) | |
| return int(service_start_utc.timestamp()) | |
| def translate_occupancy(status): | |
| """Maps GTFS occupancy enums to human readable strings.""" | |
| mapping = { | |
| 0: "Empty", 1: "Many Seats Available", 2: "Few Seats Available", | |
| 3: "No Seats Available", 5: "Full", 6: "Not In Service" | |
| } | |
| return mapping.get(status, "Full") # when in doubt assume the bus is full |