struct tm *brktimegm(time_t secs, struct tm *tm) { int days, y, ny, m; int md[] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }; days = secs / 86400; secs %= 86400; tm->tm_hour = secs / 3600; tm->tm_min = (secs % 3600) / 60; tm->tm_sec = secs % 60; /* oh well, may be someone some day will invent a formula for this stuff */ y = 1970; /* start "guessing" */ while (days >= (ISLEAP(y)?366:365)) { ny = (y + days/366); days -= (ny - y) * 365 + LEAPS_COUNT(ny - 1) - LEAPS_COUNT(y - 1); y = ny; } md[1] = ISLEAP(y)?29:28; for (m=0; days >= md[m]; m++) days -= md[m]; tm->tm_year = y; /* unlike gmtime_r we store complete year here */ tm->tm_mon = m+1; /* unlike gmtime_r tm_mon is from 1 to 12 */ tm->tm_mday = days+1; return tm; }