Initial project import

2026-07-24 23:11:20 +08:00
commit 6396eabb87
372 changed files with 49682 additions and 0 deletions
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+namespace MiaoJiZhang.Api.Services;
+
+public static class ChinaClock
+{
+    private static readonly Lazy<TimeZoneInfo> Zone = new(() =>
+    {
+        try
+        {
+            return TimeZoneInfo.FindSystemTimeZoneById("Asia/Shanghai");
+        }
+        catch (TimeZoneNotFoundException)
+        {
+            return TimeZoneInfo.FindSystemTimeZoneById("China Standard Time");
+        }
+    });
+
+    public static DateTime Now => ToLocal(DateTime.UtcNow);
+
+    public static DateTime ToLocal(DateTime utc) =>
+        TimeZoneInfo.ConvertTimeFromUtc(
+            DateTime.SpecifyKind(utc, DateTimeKind.Utc),
+            Zone.Value);
+
+    public static DateTime ToUtc(DateTime local) =>
+        TimeZoneInfo.ConvertTimeToUtc(
+            DateTime.SpecifyKind(local, DateTimeKind.Unspecified),
+            Zone.Value);
+
+    public static (DateTime Start, DateTime End) WeekRangeUtc(DateTime localDate)
+    {
+        var date = DateTime.SpecifyKind(localDate.Date, DateTimeKind.Unspecified);
+        var offset = ((int)date.DayOfWeek + 6) % 7;
+        var start = date.AddDays(-offset);
+        return (ToUtc(start), ToUtc(start.AddDays(7)));
+    }
+
+    public static (DateTime Start, DateTime End) MonthRangeUtc(int year, int month)
+    {
+        var start = new DateTime(year, month, 1);
+        return (ToUtc(start), ToUtc(start.AddMonths(1)));
+    }
+
+    public static (DateTime Start, DateTime End) YearRangeUtc(int year)
+    {
+        var start = new DateTime(year, 1, 1);
+        return (ToUtc(start), ToUtc(start.AddYears(1)));
+    }
+}
+