Set date label to Todat or Yesterday when applied for best readability

app/src/main/java/chat/rocket/android/helper/DateTime.java

@@ -5,7 +5,10 @@ import android.text.format.DateFormat;
 
 import java.text.ParseException;
 import java.text.SimpleDateFormat;
+import java.time.Instant;
+import java.time.temporal.ChronoUnit;
 import java.util.Calendar;
+import java.util.Date;
 import java.util.GregorianCalendar;
 import java.util.Locale;
 import java.util.TimeZone;
@@ -56,7 +59,7 @@ public class DateTime {
       case DAY:
         return DAY_FORMAT.format(cal.getTime());
       case DATE:
-        return DATE_FORMAT.format(cal.getTime());
+        return getDateFormat(cal.getTime());
       case TIME:
         return TIME_FORMAT.format(cal.getTime());
       case DATE_TIME:
@@ -81,6 +84,22 @@ public class DateTime {
     }
   }
 
+  private static String getDateFormat(Date dateTime) {
+      Calendar calendar = Calendar.getInstance();
+      calendar.setTime(dateTime);
+      Calendar today = Calendar.getInstance();
+      Calendar yesterday = Calendar.getInstance();
+      yesterday.add(Calendar.DATE, -1);
+
+      if (calendar.get(Calendar.YEAR) == today.get(Calendar.YEAR) && calendar.get(Calendar.DAY_OF_YEAR) == today.get(Calendar.DAY_OF_YEAR)) {
+        return "Today";
+      } else if (calendar.get(Calendar.YEAR) == yesterday.get(Calendar.YEAR) && calendar.get(Calendar.DAY_OF_YEAR) == yesterday.get(Calendar.DAY_OF_YEAR)) {
+        return "Yesterday";
+      } else {
+        return DATE_FORMAT.format(dateTime);
+      }
+  }
+
   /**
    * parse datetime string to ms.
    */