| long long __year_to_secs(long long year, int* is_leap) { |
| if (year - 2ULL <= 136) { |
| int y = year; |
| int leaps = (y - 68) >> 2; |
| if (!((y - 68) & 3)) { |
| leaps--; |
| if (is_leap) |
| *is_leap = 1; |
| } else if (is_leap) |
| *is_leap = 0; |
| return 31536000 * (y - 70) + 86400 * leaps; |
| } |
| |
| int cycles, centuries, leaps, rem; |
| |
| if (!is_leap) |
| is_leap = &(int){0}; |
| cycles = (year - 100) / 400; |
| rem = (year - 100) % 400; |
| if (rem < 0) { |
| cycles--; |
| rem += 400; |
| } |
| if (!rem) { |
| *is_leap = 1; |
| centuries = 0; |
| leaps = 0; |
| } else { |
| if (rem >= 200) { |
| if (rem >= 300) |
| centuries = 3, rem -= 300; |
| else |
| centuries = 2, rem -= 200; |
| } else { |
| if (rem >= 100) |
| centuries = 1, rem -= 100; |
| else |
| centuries = 0; |
| } |
| if (!rem) { |
| *is_leap = 0; |
| leaps = 0; |
| } else { |
| leaps = rem / 4U; |
| rem %= 4U; |
| *is_leap = !rem; |
| } |
| } |
| |
| leaps += 97 * cycles + 24 * centuries - *is_leap; |
| |
| return (year - 100) * 31536000LL + leaps * 86400LL + 946684800 + 86400; |
| } |
