diff --git a/app/src/main/kotlin/com/simplemobiletools/calendar/helpers/DBHelper.kt b/app/src/main/kotlin/com/simplemobiletools/calendar/helpers/DBHelper.kt
index 8913c0f7b..0d0d8b794 100644
--- a/app/src/main/kotlin/com/simplemobiletools/calendar/helpers/DBHelper.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/calendar/helpers/DBHelper.kt
@@ -14,6 +14,7 @@ import com.simplemobiletools.calendar.extensions.*
 import com.simplemobiletools.calendar.models.Event
 import com.simplemobiletools.calendar.models.EventType
 import com.simplemobiletools.commons.extensions.getIntValue
+import com.simplemobiletools.commons.extensions.getLongValue
 import com.simplemobiletools.commons.extensions.getStringValue
 import org.joda.time.DateTime
 import java.util.*
@@ -33,6 +34,7 @@ class DBHelper private constructor(val context: Context) : SQLiteOpenHelper(cont
     private val COL_EVENT_TYPE = "event_type"
     private val COL_OFFSET = "offset"
     private val COL_IS_DST_INCLUDED = "is_dst_included"
+    private val COL_LAST_UPDATED = "last_updated"
 
     private val META_TABLE_NAME = "events_meta"
     private val COL_EVENT_ID = "event_id"
@@ -56,7 +58,7 @@ class DBHelper private constructor(val context: Context) : SQLiteOpenHelper(cont
     private val mDb: SQLiteDatabase = writableDatabase
 
     companion object {
-        private val DB_VERSION = 13
+        private val DB_VERSION = 14
         val DB_NAME = "events.db"
         val REGULAR_EVENT_TYPE_ID = 1
         var dbInstance: DBHelper? = null
@@ -76,7 +78,7 @@ class DBHelper private constructor(val context: Context) : SQLiteOpenHelper(cont
         db.execSQL("CREATE TABLE $MAIN_TABLE_NAME ($COL_ID INTEGER PRIMARY KEY, $COL_START_TS INTEGER, $COL_END_TS INTEGER, $COL_TITLE TEXT, " +
                 "$COL_DESCRIPTION TEXT, $COL_REMINDER_MINUTES INTEGER, $COL_REMINDER_MINUTES_2 INTEGER, $COL_REMINDER_MINUTES_3 INTEGER, " +
                 "$COL_IMPORT_ID TEXT, $COL_FLAGS INTEGER, $COL_EVENT_TYPE INTEGER NOT NULL DEFAULT $REGULAR_EVENT_TYPE_ID, " +
-                "$COL_PARENT_EVENT_ID INTEGER, $COL_OFFSET TEXT, $COL_IS_DST_INCLUDED INTEGER)")
+                "$COL_PARENT_EVENT_ID INTEGER, $COL_OFFSET TEXT, $COL_IS_DST_INCLUDED INTEGER, $COL_LAST_UPDATED INTEGER)")
 
         createMetaTable(db)
         createTypesTable(db)
@@ -141,6 +143,10 @@ class DBHelper private constructor(val context: Context) : SQLiteOpenHelper(cont
                 db.execSQL("ALTER TABLE $EXCEPTIONS_TABLE_NAME ADD COLUMN $COL_CHILD_EVENT_ID INTEGER NOT NULL DEFAULT 0")
             }
         }
+
+        if (oldVersion < 14) {
+            db.execSQL("ALTER TABLE $MAIN_TABLE_NAME ADD COLUMN $COL_LAST_UPDATED INTEGER NOT NULL DEFAULT 0")
+        }
     }
 
     private fun createMetaTable(db: SQLiteDatabase) {
@@ -218,6 +224,7 @@ class DBHelper private constructor(val context: Context) : SQLiteOpenHelper(cont
             put(COL_PARENT_EVENT_ID, event.parentId)
             put(COL_OFFSET, event.offset)
             put(COL_IS_DST_INCLUDED, if (event.isDstIncluded) 1 else 0)
+            put(COL_LAST_UPDATED, System.currentTimeMillis())
         }
     }
 
@@ -641,7 +648,7 @@ class DBHelper private constructor(val context: Context) : SQLiteOpenHelper(cont
     private val allColumns: Array<String>
         get() = arrayOf("$MAIN_TABLE_NAME.$COL_ID", COL_START_TS, COL_END_TS, COL_TITLE, COL_DESCRIPTION, COL_REMINDER_MINUTES, COL_REMINDER_MINUTES_2,
                 COL_REMINDER_MINUTES_3, COL_REPEAT_INTERVAL, COL_REPEAT_RULE, COL_IMPORT_ID, COL_FLAGS, COL_REPEAT_LIMIT, COL_EVENT_TYPE, COL_OFFSET,
-                COL_IS_DST_INCLUDED)
+                COL_IS_DST_INCLUDED, COL_LAST_UPDATED)
 
     private fun fillEvents(cursor: Cursor?): List<Event> {
         val events = ArrayList<Event>()
@@ -664,6 +671,7 @@ class DBHelper private constructor(val context: Context) : SQLiteOpenHelper(cont
                     val eventType = cursor.getIntValue(COL_EVENT_TYPE)
                     val offset = cursor.getStringValue(COL_OFFSET)
                     val isDstIncluded = cursor.getIntValue(COL_IS_DST_INCLUDED) == 1
+                    val lastUpdated = cursor.getLongValue(COL_LAST_UPDATED)
 
                     val ignoreEventOccurrences = if (repeatInterval != 0) {
                         getIgnoredOccurrences(id)
@@ -676,7 +684,8 @@ class DBHelper private constructor(val context: Context) : SQLiteOpenHelper(cont
                     }
 
                     val event = Event(id, startTS, endTS, title, description, reminder1Minutes, reminder2Minutes, reminder3Minutes,
-                            repeatInterval, importId, flags, repeatLimit, repeatRule, eventType, ignoreEventOccurrences, offset, isDstIncluded)
+                            repeatInterval, importId, flags, repeatLimit, repeatRule, eventType, ignoreEventOccurrences, offset, isDstIncluded,
+                            0, lastUpdated)
                     events.add(event)
                 } while (cursor.moveToNext())
             }
diff --git a/app/src/main/kotlin/com/simplemobiletools/calendar/models/Event.kt b/app/src/main/kotlin/com/simplemobiletools/calendar/models/Event.kt
index 92ff84b1d..75e4a057f 100644
--- a/app/src/main/kotlin/com/simplemobiletools/calendar/models/Event.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/calendar/models/Event.kt
@@ -11,7 +11,7 @@ data class Event(var id: Int = 0, var startTS: Int = 0, var endTS: Int = 0, var
                  var reminder1Minutes: Int = -1, var reminder2Minutes: Int = -1, var reminder3Minutes: Int = -1, var repeatInterval: Int = 0,
                  var importId: String? = "", var flags: Int = 0, var repeatLimit: Int = 0, var repeatRule: Int = 0,
                  var eventType: Int = DBHelper.REGULAR_EVENT_TYPE_ID, var ignoreEventOccurrences: ArrayList<Int> = ArrayList(),
-                 var offset: String = "", var isDstIncluded: Boolean = false, var parentId: Int = 0) : Serializable {
+                 var offset: String = "", var isDstIncluded: Boolean = false, var parentId: Int = 0, var lastUpdated: Long = 0L) : Serializable {
 
     companion object {
         private val serialVersionUID = -32456795132345616L