diff --git a/uhabits-core/src/jvmTest/java/org/isoron/uhabits/core/utils/DateUtilsTest.kt b/uhabits-core/src/jvmTest/java/org/isoron/uhabits/core/utils/DateUtilsTest.kt
index 19534a5bd..13cd6291a 100644
--- a/uhabits-core/src/jvmTest/java/org/isoron/uhabits/core/utils/DateUtilsTest.kt
+++ b/uhabits-core/src/jvmTest/java/org/isoron/uhabits/core/utils/DateUtilsTest.kt
@@ -118,17 +118,24 @@ class DateUtilsTest : BaseUnitTest() {
         assertThat(arrayOf("Sat", "Sun", "Mon", "Tue", "Wed", "Thu", "Fri"), equalTo(longWeekdayNames))
     }
 
+    private fun getCalendarUTC(year: Int, month: Int, dayOfMonth: Int): GregorianCalendar {
+        val gregCalendar = GregorianCalendar(year, month, dayOfMonth)
+        gregCalendar.timeZone = TimeZone.getTimeZone("UTC")
+        return gregCalendar
+    }
+
     @Test
     fun getWeekdaysInMonth() {
-        val february = GregorianCalendar(2018, Calendar.FEBRUARY, 1)
-        val leapFebruary = GregorianCalendar(2020, Calendar.FEBRUARY, 1)
-        val month = GregorianCalendar(2020, Calendar.APRIL, 1)
-        val longMonth = GregorianCalendar(2020, Calendar.AUGUST, 1)
+        val february = getCalendarUTC(2018, Calendar.FEBRUARY, 1)
+        val leapFebruary = getCalendarUTC(2020, Calendar.FEBRUARY, 1)
+        val month = getCalendarUTC(2020, Calendar.APRIL, 1)
+        val longMonth = getCalendarUTC(2020, Calendar.AUGUST, 1)
 
         assertThat(
             arrayOf(4, 4, 4, 4, 4, 4, 4),
             equalTo(DateUtils.getWeekdaysInMonth(Timestamp(february)))
         )
+
         assertThat(
             arrayOf(5, 4, 4, 4, 4, 4, 4),
             equalTo(DateUtils.getWeekdaysInMonth(Timestamp(leapFebruary)))