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https://github.com/mirkobrombin/raven.git
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Raymond Bennett
3086e103dd
Under TZ=America/New_York, GetTimeZoneInformation gives the US rules (first Sunday of November and second Sunday of March at 2:00, an hour apart), and GetTimeZoneInformationForYear the same for 2030. Assisted-by: Claude Code:claude-opus-5-5 AI-Scope: the test client and its registration (cherry picked from commit ac6e590c9175a6e7236a751d0f4559d8ec34ffd5)
28 lines
1.1 KiB
C
28 lines
1.1 KiB
C
#include <windows.h>
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// The daylight saving rules of America/New_York (the test sets TZ): standard time starts on the first Sunday of November at 2:00,
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// daylight time on the second Sunday of March at 2:00, an hour ahead; GetTimeZoneInformationForYear gives the same rules for 2030.
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// Returns 0, or the number of the check that failed.
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static int rule(const SYSTEMTIME *date, WORD month, WORD occurrence)
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{
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return date->wYear == 0 && date->wMonth == month && date->wDayOfWeek == 0 && date->wDay == occurrence && date->wHour == 2 && date->wMinute == 0;
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}
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int raven_entry(void)
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{
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TIME_ZONE_INFORMATION zone;
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const DWORD result = GetTimeZoneInformation(&zone);
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if (result != TIME_ZONE_ID_STANDARD && result != TIME_ZONE_ID_DAYLIGHT)
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return 1;
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if (zone.Bias != 300 || zone.DaylightBias != -60 || zone.StandardBias != 0)
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return 2;
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if (!rule(&zone.StandardDate, 11, 1) || !rule(&zone.DaylightDate, 3, 2))
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return 3;
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TIME_ZONE_INFORMATION later;
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if (!GetTimeZoneInformationForYear(2030, NULL, &later))
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return 4;
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if (!rule(&later.StandardDate, 11, 1) || !rule(&later.DaylightDate, 3, 2))
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return 5;
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return 0;
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}
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