修复(计费): 公历反算避免 i64 溢出

civil_from_days 用 saturating_add 计算日序号偏移，消除 date_key 接近 i64::MAX 时的加法溢出 Co-authored-by: Junie <junie@jetbrains.com>
2026-10-02 19:12:34 +08:00
parent 603ecb0887
commit 8b8213f0c8
1 changed files with 1 additions and 1 deletions
@@ -36,7 +36,7 @@ pub fn days_from_civil(year: i32, month: u8, day: u8) -> i64 {
 /// 1970-01-01 起的日序号 → 公历年月日。
 pub fn civil_from_days(date_key: i64) -> (i32, u8, u8) {
    // 中文注释：days_from_civil 的反向算法，避免依赖运行环境时区。
-    let z = date_key + 719_468;
+    let z = date_key.saturating_add(719_468);
    let era = z.div_euclid(146_097);
    let day_of_era = z - era * 146_097;
    let year_of_era = (day_of_era - day_of_era / 1_460 + day_of_era / 36_524