Index: src/testcases/org/apache/poi/ss/formula/functions/TestDays360.java
===================================================================
--- src/testcases/org/apache/poi/ss/formula/functions/TestDays360.java	(revision 1757106)
+++ src/testcases/org/apache/poi/ss/formula/functions/TestDays360.java	(working copy)
@@ -67,6 +67,24 @@
         confirm(-2, makeDate(1993, 2, 28), makeDate(1993, 2, 28), false);
         confirm(3, makeDate(1993, 2, 28), makeDate(1993, 3, 1), true);
         confirm(2, makeDate(1996, 2, 29), makeDate(1996, 3, 1), true);
+
+		// bug 60029
+		Date start = makeDate(2018, 02, 28);
+		Date end = makeDate(2018, 03, 31);
+		confirm(30, start, end, false);
+
+		// examples from https://support.office.com/en-us/article/DAYS360-function-B9A509FD-49EF-407E-94DF-0CBDA5718C2A
+		start = makeDate(2011, 01, 30);
+		end = makeDate(2011, 02, 01);
+		confirm(1, start, end, false);
+
+		start = makeDate(2011, 01, 01);
+		end = makeDate(2011, 12, 31);
+		confirm(360, start, end, false);
+
+		start = makeDate(2011, 01, 01);
+		end = makeDate(2011, 02, 01);
+		confirm(30, start, end, false);
 	}
 
 	private static void confirm(int expResult, int y1, int m1, int d1, int y2, int m2, int d2) {