Date without time

marcos-lg · marcos-lg · commit 914859d629be · 2018-06-24T12:15:09.000+02:00
diff --git a/core-java/src/main/java/com/baeldung/date/DateWithoutTime.java b/core-java/src/main/java/com/baeldung/date/DateWithoutTime.java
@@ -0,0 +1,30 @@
+package com.baeldung.date;
+
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
+import java.time.LocalDate;
+import java.util.Calendar;
+import java.util.Date;
+
+public class DateWithoutTime {
+
+    public static Date getDateWithoutTimeUsingCalendar() {
+        Calendar calendar = Calendar.getInstance();
+        calendar.set(Calendar.HOUR_OF_DAY, 0);
+        calendar.set(Calendar.MINUTE, 0);
+        calendar.set(Calendar.SECOND, 0);
+        calendar.set(Calendar.MILLISECOND, 0);
+
+        return calendar.getTime();
+    }
+
+    public static Date getDateWithoutTimeUsingFormat() throws ParseException {
+        SimpleDateFormat formatter = new SimpleDateFormat("dd/MM/yyyy");
+        return formatter.parse(formatter.format(new Date()));
+    }
+
+    public static LocalDate getLocalDate() {
+        return LocalDate.now();
+    }
+
+}
diff --git a/core-java/src/test/java/com/baeldung/date/DateWithoutTimeUnitTest.java b/core-java/src/test/java/com/baeldung/date/DateWithoutTimeUnitTest.java
@@ -0,0 +1,80 @@
+package com.baeldung.date;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.text.ParseException;
+import java.time.LocalDate;
+import java.time.OffsetDateTime;
+import java.time.temporal.TemporalField;
+import java.util.Calendar;
+import java.util.Date;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+public class DateWithoutTimeUnitTest {
+
+    private static final long MILLISECONDS_PER_DAY = 24 * 60 * 60 * 1000;
+
+    @Test
+    public void whenGettingDateWithoutTimeUsingCalendar_thenReturnDateWithoutTime() {
+        Date dateWithoutTime = DateWithoutTime.getDateWithoutTimeUsingCalendar();
+
+        // first check the time is set to 0
+        Calendar calendar = Calendar.getInstance();
+        calendar.setTime(dateWithoutTime);
+
+        assertEquals(0, calendar.get(Calendar.HOUR_OF_DAY));
+        assertEquals(0, calendar.get(Calendar.MINUTE));
+        assertEquals(0, calendar.get(Calendar.SECOND));
+        assertEquals(0, calendar.get(Calendar.MILLISECOND));
+
+        // now check the difference with the current Date with time is less than a day.
+        assertTrue(new Date().getTime() - dateWithoutTime.getTime() < MILLISECONDS_PER_DAY);
+    }
+
+    @Test
+    public void whenGettingDateWithoutTimeUsingFormat_thenReturnDateWithoutTime() {
+        Date dateWithoutTime = null;
+        try {
+            dateWithoutTime = DateWithoutTime.getDateWithoutTimeUsingFormat();
+        } catch (ParseException e) {
+            Assert.fail();
+        }
+
+        // first check the time is set to 0
+        Calendar calendar = Calendar.getInstance();
+        calendar.setTime(dateWithoutTime);
+
+        assertEquals(0, calendar.get(Calendar.HOUR_OF_DAY));
+        assertEquals(0, calendar.get(Calendar.MINUTE));
+        assertEquals(0, calendar.get(Calendar.SECOND));
+        assertEquals(0, calendar.get(Calendar.MILLISECOND));
+
+        // now check the difference with the current Date with time is less than a day.
+        assertTrue(new Date().getTime() - dateWithoutTime.getTime() < MILLISECONDS_PER_DAY);
+    }
+
+    @Test
+    public void whenGettingLocalDate_thenReturnDateWithoutTime() {
+        // get the local date
+        LocalDate localDate = DateWithoutTime.getLocalDate();
+
+        // get the millis of our LocalDate
+        long millisLocalDate = localDate
+          .atStartOfDay()
+          .toInstant(OffsetDateTime
+            .now()
+            .getOffset())
+          .toEpochMilli();
+
+
+        // get current millis from Date with time
+        long millisDate = new Date().getTime();
+
+        // the difference in time has to be less than a day
+        assertTrue(millisDate - millisLocalDate < MILLISECONDS_PER_DAY);
+    }
+
+}
