SharePoint folder "modified" date not accurate

[FabvE]

Hi,

the date in the system column "modified" for folders is not accurate. Although new files are created within the folder or modified, the folders modified date does not change.

Which events trigger the modified date of a folder?

Thx for your help. :)

Best regards

[#2]

I think that folder modified date only updated when we create, or rename folder in SharePoint library.

It will not include changes in the subfolders or files within the folder.

I checked following and it is not working.

Create new file in folder
Update file in folder
Delete file in folder

[#3]

@FabvE Modified date of folder in SharePoint document library will not change if new files added/edited inside the folder as mentioned by @NikolasAli 

Modified date of folder only changes when you change the create a new folder, rename an existing folder or change any metadata associated with the folder.

Similar threads: 

1. Update the folder content it doesn't update last modified field 
2. SharePoint - Modified date for a folder is not updated when a subitem is updated 

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