Grand Rapids時間
21:19:31
日出: 07:12:56 
日落: 18:35:3910:19:31
05:19:31
23:19:31
07:49:31
20:19:31
10:19:31
07:19:31
10:19:31
10:19:31
07:49:31
05:19:31
10:19:31
08:19:31
11:19:31
23:19:31
Grand Rapids與主要城市的時差
+7
+7
+7
+7
+6
+6
+6
+6
+6
+6
+5
+5
+5
+2
+2
+2
+2
+1
+0
+0
+0
-1
-3