尝试针对魅族20系设计新的计算逻辑

lib/utils/time_utils.dart

@@ -0,0 +1,48 @@
+import 'dart:developer' as dev;
+
+class TimeUtils {
+  /// 解析日志行中的时间戳，强制解析为 UTC
+  static DateTime? parseLogTimestamp(String line) {
+    final reg = RegExp(r'\[(\d{4}-\d{2}-\d{2}) (\d{2}:\d{2}:\d{2})\]');
+    final match = reg.firstMatch(line);
+    if (match == null) return null;
+    try {
+      final dateParts = match.group(1)!.split('-');
+      final timeParts = match.group(2)!.split(':');
+      return DateTime.utc(
+        int.parse(dateParts[0]),
+        int.parse(dateParts[1]),
+        int.parse(dateParts[2]),
+        int.parse(timeParts[0]),
+        int.parse(timeParts[1]),
+        int.parse(timeParts[2]),
+      );
+    } catch (_) {
+      return null;
+    }
+  }
+
+  /// 判断日志时间戳是否在有效窗口内
+  static bool isLogTimestampValid(
+    DateTime? logTime,
+    DateTime? chargingStartTime,
+  ) {
+    if (logTime == null) return false;
+    if (chargingStartTime == null) {
+      final nowUtc = DateTime.now().toUtc();
+      final diff = nowUtc.difference(logTime);
+      return diff.abs().inMinutes <= 3;
+    }
+    final endTime = chargingStartTime.add(const Duration(minutes: 3));
+    return logTime.isAfter(chargingStartTime) && logTime.isBefore(endTime);
+  }
+
+  /// 生成今日日志文件名（UTC）
+  static String getTodayFileName() {
+    final nowUtc = DateTime.now().toUtc();
+    final year = nowUtc.year.toString();
+    final month = nowUtc.month.toString().padLeft(2, '0');
+    final day = nowUtc.day.toString().padLeft(2, '0');
+    return 'mbattery_charger_log_${year}_${month}_$day';
+  }
+}