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diff --git a/tests/unit/src/com/android/car/calendar/common/CalendarFormatterTest.java b/tests/unit/src/com/android/car/calendar/common/CalendarFormatterTest.java
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+++ b/tests/unit/src/com/android/car/calendar/common/CalendarFormatterTest.java
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+/*
+ * Copyright 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.car.calendar.common;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import android.content.Context;
+
+import androidx.test.platform.app.InstrumentationRegistry;
+
+import org.junit.Before;
+import org.junit.Test;
+
+import java.time.Clock;
+import java.time.LocalDateTime;
+import java.time.ZoneId;
+import java.time.ZonedDateTime;
+import java.util.Locale;
+
+public class CalendarFormatterTest {
+
+    private static final ZoneId BERLIN_ZONE_ID = ZoneId.of("Europe/Berlin");
+    private static final ZonedDateTime CURRENT_DATE_TIME =
+            LocalDateTime.of(2019, 12, 10, 10, 10, 10, 500500).atZone(BERLIN_ZONE_ID);
+    private static final Locale LOCALE = Locale.ENGLISH;
+    private CalendarFormatter mFormatter;
+
+    @Before
+    public void setUp() {
+        Context context = InstrumentationRegistry.getInstrumentation().getTargetContext();
+        Clock clock = Clock.fixed(CURRENT_DATE_TIME.toInstant(), BERLIN_ZONE_ID);
+        mFormatter = new CalendarFormatter(context, LOCALE, clock);
+    }
+
+    @Test
+    public void getDateText_today() {
+        String dateText = mFormatter.getDateText(CURRENT_DATE_TIME.toLocalDate());
+
+        assertThat(dateText).startsWith("Today");
+        assertThat(dateText).endsWith("Tue, Dec 10");
+    }
+
+    @Test
+    public void getDateText_tomorrow() {
+        String dateText = mFormatter.getDateText(CURRENT_DATE_TIME.plusDays(1).toLocalDate());
+
+        assertThat(dateText).startsWith("Tomorrow");
+        assertThat(dateText).endsWith("Wed, Dec 11");
+    }
+
+    @Test
+    public void getDateText_nextWeek_onlyShowsDate() {
+        String dateText = mFormatter.getDateText(CURRENT_DATE_TIME.plusDays(7).toLocalDate());
+
+        assertThat(dateText).isEqualTo("Tue, Dec 17");
+    }
+
+    @Test
+    public void getTimeRangeText_sameAmPm() {
+        String dateText =
+                mFormatter.getTimeRangeText(
+                        CURRENT_DATE_TIME.toInstant(), CURRENT_DATE_TIME.plusHours(1).toInstant());
+
+        assertThat(dateText).isEqualTo("10:10 – 11:10 AM");
+    }
+
+    @Test
+    public void getTimeRangeText_differentAmPm() {
+        String dateText =
+                mFormatter.getTimeRangeText(
+                        CURRENT_DATE_TIME.toInstant(), CURRENT_DATE_TIME.plusHours(3).toInstant());
+
+        assertThat(dateText).isEqualTo("10:10 AM – 1:10 PM");
+    }
+
+    @Test
+    public void getTimeRangeText_differentDays() {
+        String dateText =
+                mFormatter.getTimeRangeText(
+                        CURRENT_DATE_TIME.toInstant(), CURRENT_DATE_TIME.plusDays(1).toInstant());
+
+        assertThat(dateText).isEqualTo("Dec 10, 10:10 AM – Dec 11, 10:10 AM");
+    }
+}