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chrome/android/java/src/org/chromium/chrome/browser/download/DownloadUtils.java

Index: chrome/android/java/src/org/chromium/chrome/browser/download/DownloadUtils.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadUtils.java b/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadUtils.java
index b989159158052b5abf18049dd18069fc7d1783b1..6099145a7be22a8cadef771ebb3d00c9c9d49c42 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadUtils.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadUtils.java
@@ -56,6 +56,8 @@ import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 import java.text.NumberFormat;
 import java.util.ArrayList;
+import java.util.Calendar;
+import java.util.Date;
 import java.util.List;
 import java.util.Locale;
 
@@ -742,4 +744,25 @@ public class DownloadUtils {
 
         return MIME_TYPE_VIDEO.equals(pieces[0]);
     }
+
+    /**
+     * Given two timestamps, calculates if both occur on the same date.
+     * @return True if they belong in the same day. False otherwise.
+     */
+    public static boolean isSameDay(long timestamp1, long timestamp2) {
+        return getDateAtMidnight(timestamp1).equals(getDateAtMidnight(timestamp2));
+    }
+
+    /**
+     * Calculates the {@link Date} for midnight of the date represented by the |timestamp|.
+     */
+    public static Date getDateAtMidnight(long timestamp) {
+        Calendar cal = Calendar.getInstance();
+        cal.setTimeInMillis(timestamp);
+        cal.set(Calendar.HOUR_OF_DAY, 0);
+        cal.set(Calendar.MINUTE, 0);
+        cal.set(Calendar.SECOND, 0);
+        cal.set(Calendar.MILLISECOND, 0);
+        return cal.getTime();
+    }
 }