BAEL-3140: Comparing Dates in Java - examples.

java-dates-2/src/main/java/com/baeldung/date/comparison/DateTimeComparisonUtils.java

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+package com.baeldung.date.comparison;
+
+import java.time.LocalDate;
+import java.time.LocalDateTime;
+import java.time.ZoneId;
+import java.time.ZonedDateTime;
+
+import static java.time.temporal.ChronoUnit.*;
+
+public class DateTimeComparisonUtils {
+
+    public static boolean isSameDay(LocalDateTime timestamp, LocalDate localDateToCompare) {
+        return timestamp.toLocalDate().isEqual(localDateToCompare);
+    }
+
+    public static boolean isSameDay(LocalDateTime timestamp, LocalDateTime timestampToCompare) {
+        return timestamp.truncatedTo(DAYS).isEqual(timestampToCompare.truncatedTo(DAYS));
+    }
+
+    public static boolean isSameHour(LocalDateTime timestamp, LocalDateTime timestampToCompare) {
+        return timestamp.truncatedTo(HOURS).isEqual(timestampToCompare.truncatedTo(HOURS));
+    }
+
+    public static boolean isSameMinute(LocalDateTime timestamp, LocalDateTime timestampToCompare) {
+        return timestamp.truncatedTo(MINUTES).isEqual(timestampToCompare.truncatedTo(MINUTES));
+    }
+
+    public static boolean isSameHour(ZonedDateTime zonedTimestamp, ZonedDateTime zonedTimestampToCompare) {
+        return zonedTimestamp.truncatedTo(HOURS).isEqual(zonedTimestampToCompare.truncatedTo(HOURS));
+    }
+
+    public static boolean isSameHour(ZonedDateTime zonedDateTime, LocalDateTime localDateTime, ZoneId zoneId) {
+        return isSameHour(zonedDateTime, localDateTime.atZone(zoneId));
+    }
+}

java-dates-2/src/main/java/com/baeldung/date/comparison/LegacyDateComparisonUtils.java

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+package com.baeldung.date.comparison;
+
+import org.apache.commons.lang3.time.DateUtils;
+
+import java.util.Calendar;
+import java.util.Date;
+
+public class LegacyDateComparisonUtils {
+
+    public static boolean isSameDay(Date date, Date dateToCompare) {
+        return DateUtils.isSameDay(date, dateToCompare);
+    }
+
+    public static boolean isSameHour(Date date, Date dateToCompare) {
+        return DateUtils.truncatedEquals(date, dateToCompare, Calendar.HOUR);
+    }
+}