Fix getUTCOffSet rounding for non-integer timezones

src/main/java/com/luckycatlabs/sunrisesunset/calculator/SolarEventCalculator.java

@@ -375,7 +375,7 @@ private BigDecimal getDayOfYear(Calendar date) {
 
     private BigDecimal getUTCOffSet(Calendar date) {
         BigDecimal offSetInMillis = new BigDecimal(date.get(Calendar.ZONE_OFFSET));
-        BigDecimal offSet = offSetInMillis.divide(new BigDecimal(3600000), new MathContext(2));
+        BigDecimal offSet = divideBy(offSetInMillis, BigDecimal.valueOf(3600000));
         return offSet;
     }
 

src/test/java/com/luckycatlabs/sunrisesunset/SunriseSunsetCalculatorTest.java

@@ -108,4 +108,27 @@ public void testNonIntegerTimezoneOffset() {
         String officialSunriseForDate = calculator.getOfficialSunriseForDate(calendar);
         assertEquals("06:19", officialSunriseForDate);
     }
+
+    @Test
+    public void testNonIntegerTimezoneOffset2() {
+        // Asia/Kathmandu (+5:45, no DST)
+        Location kathmandu = new Location("27.7172", "85.3240");
+        SunriseSunsetCalculator calc = new SunriseSunsetCalculator(kathmandu, "Asia/Kathmandu");
+
+        Calendar calendar = Calendar.getInstance();
+        calendar.set(2024, Calendar.JUNE, 15);
+
+        assertEquals("05:08", calc.getOfficialSunriseForDate(calendar));
+        assertEquals("19:01", calc.getOfficialSunsetForDate(calendar));
+
+        // Pacific/Chatham (+12:45), outside DST window (July is southern winter)
+        Location chatham = new Location("-43.8800", "176.3200");
+        calc = new SunriseSunsetCalculator(chatham, "Pacific/Chatham");
+
+        calendar = Calendar.getInstance();
+        calendar.set(2024, Calendar.JULY, 15);
+
+        assertEquals("08:29", calc.getOfficialSunriseForDate(calendar));
+        assertEquals("17:42", calc.getOfficialSunsetForDate(calendar));
+    }
 }