Halver time to Shiguai time conversion
18:31:23
+6
00:31:23
+7
+7
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+6
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+5
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+5
+4.5
+4
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+4
+4
+3.5
+3.5
+3.5
+3.5
+3.5
+3.5
+3.5
+3.5
+3.5
+3.5
+3
+3
+2.5
+2
+1.5
+1
+1
+1
+1
+1
+1
+1
+1
+1
+0
+0
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+0
-1
-1
-1
-1
-1
-1
-2
-5
-5
-5
-6
-6
-6
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-7
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-9