Uptime
The Uptime integrationIntegrations connect and integrate Home Assistant with your devices, services, and more. [Learn more] provides a sensor that stores the timestamp (date and time) when Home Assistant was last started.
Configuration
To add the Uptime service to your Home Assistant instance, use this My button:
        Manual configuration steps
      
      
      
      
    
    If the above My button doesn’t work, you can also perform the following steps manually:
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Browse to your Home Assistant instance.
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In the bottom right corner, select the
Add Integration button.  - 
From the list, select Uptime.
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Follow the instructions on screen to complete the setup.