修改 FlyAD7的 now 第一次获取 毫秒取整

Project.FLY.FlyADBase/FlyADBase/FlyAD7.cs

@@ -1862,6 +1862,10 @@ namespace FlyADBase
             if (dt_1st == DateTime.MinValue)
             {
                 dt_1st = DateTime.Now;
+                //毫秒级别取整
+                long tick = dt_1st.Ticks % TimeSpan.TicksPerMillisecond;
+                dt_1st -= TimeSpan.FromTicks(tick);
+
                 systick_1st = systick;
                 return dt_1st;
             }
@@ -1873,6 +1877,10 @@ namespace FlyADBase
                 //被复位了
                 BeReseted?.Invoke();
                 dt_1st = DateTime.Now;
+                //毫秒级别取整
+                long tick = dt_1st.Ticks % TimeSpan.TicksPerMillisecond;
+                dt_1st -= TimeSpan.FromTicks(tick);
+
                 systick_1st = systick;
                 return dt_1st;
             }