checkIf date do not work

Hi.

I have problem comparing diffrent dates.

// this do not work, result always false.

{{#checkIf (date createdAt) '!=' (date modifiedAt)}}

// this does work, but I want to have true only if it has been edited on a later day.

{{#checkIf createdAt '!=' modifiedAt}}

// the full code.

{{#checkIf (date createdAt) '!=' (date modifiedAt)}}
        - Last edit
  <time datetime="{{date modifiedAt 'YYYY-MM-DDTHH:mm'}}">{{date modifiedAt}}</time>
{{/checkIf}}