diff --git a/app/src/main/kotlin/com/simplemobiletools/filemanager/dialogs/PropertiesDialog.kt b/app/src/main/kotlin/com/simplemobiletools/filemanager/dialogs/PropertiesDialog.kt
index f7e4f5c3..1ef3a74f 100644
--- a/app/src/main/kotlin/com/simplemobiletools/filemanager/dialogs/PropertiesDialog.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/filemanager/dialogs/PropertiesDialog.kt
@@ -3,7 +3,6 @@ package com.simplemobiletools.filemanager.dialogs
 import android.content.Context
 import android.content.res.Resources
 import android.support.v7.app.AlertDialog
-import android.text.format.DateFormat
 import android.view.LayoutInflater
 import android.view.ViewGroup
 import com.simplemobiletools.filemanager.Config
@@ -12,7 +11,6 @@ import com.simplemobiletools.filemanager.extensions.*
 import kotlinx.android.synthetic.main.item_properties.view.*
 import kotlinx.android.synthetic.main.property_item.view.*
 import java.io.File
-import java.util.*
 
 class PropertiesDialog() {
     lateinit var mContext: Context
@@ -36,7 +34,7 @@ class PropertiesDialog() {
         addProperty(R.string.name, file.name)
         addProperty(R.string.path, file.parent)
         addProperty(R.string.size, getItemSize(file))
-        addProperty(R.string.last_modified, formatLastModified(file.lastModified()))
+        addProperty(R.string.last_modified, file.lastModified().formatLastModified())
 
         if (file.isDirectory) {
             addProperty(R.string.files_count, mFilesCnt.toString())
@@ -73,12 +71,6 @@ class PropertiesDialog() {
         return file.length().formatSize()
     }
 
-    private fun formatLastModified(ts: Long): String {
-        val cal = Calendar.getInstance(Locale.ENGLISH)
-        cal.timeInMillis = ts
-        return DateFormat.format("dd.MM.yyyy HH:mm", cal).toString()
-    }
-
     private fun getDirectorySize(dir: File): Long {
         var size = 0L
         if (dir.exists()) {
diff --git a/app/src/main/kotlin/com/simplemobiletools/filemanager/extensions/long.kt b/app/src/main/kotlin/com/simplemobiletools/filemanager/extensions/long.kt
index 3fcceb29..31cafe25 100644
--- a/app/src/main/kotlin/com/simplemobiletools/filemanager/extensions/long.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/filemanager/extensions/long.kt
@@ -1,6 +1,8 @@
 package com.simplemobiletools.filemanager.extensions
 
+import android.text.format.DateFormat
 import java.text.DecimalFormat
+import java.util.*
 
 fun Long.formatSize(): String {
     if (this <= 0)
@@ -10,3 +12,9 @@ fun Long.formatSize(): String {
     val digitGroups = (Math.log10(toDouble()) / Math.log10(1024.0)).toInt()
     return DecimalFormat("#,##0.#").format(this / Math.pow(1024.0, digitGroups.toDouble())) + " " + units[digitGroups]
 }
+
+fun Long.formatLastModified(): String {
+    val cal = Calendar.getInstance(Locale.ENGLISH)
+    cal.timeInMillis = this
+    return DateFormat.format("dd.MM.yyyy HH:mm", cal).toString()
+}