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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 95e15539b20546aa8b97e1b408a2ed3439161748..ec129080fac2f2de4a487ba5f79f4c1836fb1528 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
@@ -53,6 +53,8 @@ import org.chromium.ui.widget.Toast;
 import java.io.File;
 import java.text.NumberFormat;
 import java.util.ArrayList;
+import java.util.Calendar;
+import java.util.Date;
 import java.util.List;
 import java.util.Locale;
 
@@ -711,4 +713,25 @@ 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 getDateWithoutTime(timestamp1).equals(getDateWithoutTime(timestamp2));
+    }
+
+    /**
+     * Calculates the {@link Date} for midnight of the date represented by the timestamp.
+     */
+    public static Date getDateWithoutTime(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();
+    }
 }