Added additional voice work update logic.

JSMR.Infrastructure/Common/Time/Clock.cs

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+namespace JSMR.Infrastructure.Common.Time;
+
+public class Clock : IClock
+{
+    public DateTimeOffset UtcNow => DateTimeOffset.UtcNow;
+}

JSMR.Infrastructure/Common/Time/IClock.cs

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+namespace JSMR.Infrastructure.Common.Time;
+
+public interface IClock
+{
+    DateTimeOffset UtcNow { get; }
+}

JSMR.Infrastructure/Common/Time/TimeProvider.cs

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+namespace JSMR.Infrastructure.Common.Time;
+
+public interface ITimeProvider
+{
+    DateTimeOffset Now();
+    DateTimeOffset Local(int year, int month, int day, int hour);
+    DateTimeOffset Local(DateTimeOffset offset);
+}
+
+public abstract class TimeProvider : ITimeProvider
+{
+    protected abstract string Id { get; }
+    protected abstract string[] TimeZoneIds { get; }
+
+    private readonly IClock _clock;
+    private readonly TimeZoneInfo _timeZone;
+
+    public TimeProvider(IClock clock)
+    {
+        _clock = clock;
+        _timeZone = ResolveTimeZone();
+    }
+
+    private TimeZoneInfo ResolveTimeZone()
+    {
+        foreach (string timeZoneId in TimeZoneIds)
+        {
+            if (TimeZoneInfo.TryFindSystemTimeZoneById(timeZoneId, out TimeZoneInfo? timeZoneInfo))
+                return timeZoneInfo;
+        }
+
+        throw new TimeZoneNotFoundException($"Unable to resolve time zone for: {Id} ({string.Join(" / ", TimeZoneIds)})");
+    }
+
+    public DateTimeOffset Now() => TimeZoneInfo.ConvertTime(_clock.UtcNow, _timeZone);
+    public DateTimeOffset Local(DateTimeOffset offset) => TimeZoneInfo.ConvertTime(offset, _timeZone);
+
+    public DateTimeOffset Local(int year, int month, int day, int hour)
+    {
+        DateTime local = new(year, month, day, hour, 0, 0, DateTimeKind.Unspecified);
+        TimeSpan offset = _timeZone.GetUtcOffset(local);
+
+        return new DateTimeOffset(local, offset);
+    }
+
+    public DateTimeOffset CurrentScanAnchor()
+    {
+        DateTimeOffset now = Now();
+        DateTimeOffset midnight = Local(now.Year, now.Month, now.Day, 0);
+        DateTimeOffset fourPm = Local(now.Year, now.Month, now.Day, 16);
+
+        return now >= fourPm ? fourPm : midnight;
+    }
+
+    public DateTimeOffset PreviousScanAnchor(DateTimeOffset scanAnchorTokyo)
+    {
+        // Normalize to Tokyo (no-op if already)
+        var a = TimeZoneInfo.ConvertTime(scanAnchorTokyo, _timeZone);
+        return a.Hour == 16
+            ? Local(a.Year, a.Month, a.Day, 0)
+            : Local(a.AddDays(-1).Year, a.AddDays(-1).Month, a.AddDays(-1).Day, 16);
+    }
+}
+
+public class TokyoTimeProvider(IClock clock) : TimeProvider(clock)
+{
+    protected override string Id => "Tokyo Standard Time";
+    protected override string[] TimeZoneIds => ["Tokyo Standard Time", "Asia/Tokyo"];
+}