diff options
Diffstat (limited to 'absl/time/internal/cctz/include/cctz/civil_time_detail.h')
-rw-r--r-- | absl/time/internal/cctz/include/cctz/civil_time_detail.h | 42 |
1 files changed, 26 insertions, 16 deletions
diff --git a/absl/time/internal/cctz/include/cctz/civil_time_detail.h b/absl/time/internal/cctz/include/cctz/civil_time_detail.h index 4cde96f1aaf1..d1b4222b1f43 100644 --- a/absl/time/internal/cctz/include/cctz/civil_time_detail.h +++ b/absl/time/internal/cctz/include/cctz/civil_time_detail.h @@ -106,54 +106,64 @@ CONSTEXPR_F int days_per_month(year_t y, month_t m) noexcept { CONSTEXPR_F fields n_day(year_t y, month_t m, diff_t d, diff_t cd, hour_t hh, minute_t mm, second_t ss) noexcept { - y += (cd / 146097) * 400; + year_t ey = y % 400; + const year_t oey = ey; + ey += (cd / 146097) * 400; cd %= 146097; if (cd < 0) { - y -= 400; + ey -= 400; cd += 146097; } - y += (d / 146097) * 400; + ey += (d / 146097) * 400; d = d % 146097 + cd; if (d > 0) { if (d > 146097) { - y += 400; + ey += 400; d -= 146097; } } else { if (d > -365) { // We often hit the previous year when stepping a civil time backwards, // so special case it to avoid counting up by 100/4/1-year chunks. - y -= 1; - d += days_per_year(y, m); + ey -= 1; + d += days_per_year(ey, m); } else { - y -= 400; + ey -= 400; d += 146097; } } if (d > 365) { - for (int n = days_per_century(y, m); d > n; n = days_per_century(y, m)) { + for (;;) { + int n = days_per_century(ey, m); + if (d <= n) break; d -= n; - y += 100; + ey += 100; } - for (int n = days_per_4years(y, m); d > n; n = days_per_4years(y, m)) { + for (;;) { + int n = days_per_4years(ey, m); + if (d <= n) break; d -= n; - y += 4; + ey += 4; } - for (int n = days_per_year(y, m); d > n; n = days_per_year(y, m)) { + for (;;) { + int n = days_per_year(ey, m); + if (d <= n) break; d -= n; - ++y; + ++ey; } } if (d > 28) { - for (int n = days_per_month(y, m); d > n; n = days_per_month(y, m)) { + for (;;) { + int n = days_per_month(ey, m); + if (d <= n) break; d -= n; if (++m > 12) { - ++y; + ++ey; m = 1; } } } - return fields(y, m, static_cast<day_t>(d), hh, mm, ss); + return fields(y + (ey - oey), m, static_cast<day_t>(d), hh, mm, ss); } CONSTEXPR_F fields n_mon(year_t y, diff_t m, diff_t d, diff_t cd, hour_t hh, minute_t mm, second_t ss) noexcept { |