Page History

...

If you are the person generating a shared dashboard link, but the person viewing the dashboard is in a different time zone than you, they will see the dashboard in your time zone, which is the time zone of the person who generated the shared dashboard link.  This This is because the time zone of the shared dashboard will follow the time zone of the user who generated the link. For example, if you generate a shared link for a dashboard and your time zone is CDT, but the people viewing the shared dashboard are in the AEDT time zone, when they open the shared dashboard, the dashboard's time zone will be displayed as CDT.

...

• You need admin permissions to clone and share dashboards. 
• Template Dashboardsare not shareable. The Share option will only be available after you clone the template dashboard. 

To share a dashboard using a shareable link

...