Keep timestamp after moving files

[Rakssob]

Hey there,
I installed Tasker to automatically moving my Whatsapp Files to the SD Card every night.
The problem is, that after Tasker moved the files, the timestamp is set to the date when the file is moved.
But: I want to keep the original timestamp (when I received the file)
Is there any opportunity to stop Tasker from overwriting my timestamp?
I'm using a Galaxy S4 wit CM 13.0 (Android 6.0.1).
Thank you in advance!

[Abdullah Alahdal]

Maybe you can try using FolderSync to sync between the two folders and there is an option to maintain the timestamp (I think).