Spotlight Date calculator Do you know the way (system pref., additional app etc.) to enable Date calculator inside Spotlight app?
I'm using regular calculator a lot but I would like to have there an option to add one time duration to another like: '30m + 20m' or '0:30 + 0:20' and get from spotlight 50m or 0:50. 

Basically format of time doesn't matter, I'm asking about functionality.

Thanks in advance.
I couldn't find a way to do it in Spotlight, but if you use Alfred app, you can add the behavior with Workflows. I found this Workflow helpful, https://github.com/LeEnno/alfred-date-calculator.