35 lines
678 B
C
35 lines
678 B
C
#include "datetime.h"
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/* roughly 100x faster than mktime() */
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datetime_sec datetime_untai(dt)
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struct datetime *dt;
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{
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int year;
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int day;
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int mon;
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year = dt->year + 1900;
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mon = dt->mon;
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if (mon >= 2) { mon -= 2; }
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else { mon += 10; --year; }
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day = (dt->mday - 1) * 10 + 5 + 306 * mon;
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day /= 10;
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if (day == 365) { year -= 3; day = 1460; }
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else { day += 365 * (year % 4); }
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year /= 4;
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day += 1461 * (year % 25);
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year /= 25;
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if (day == 36524) { year -= 3; day = 146096; }
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else { day += 36524 * (year % 4); }
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year /= 4;
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day += 146097 * (year - 5);
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day += 11017;
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return ((day * 24 + dt->hour) * 60 + dt->min) * 60 + dt->sec;
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}
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