Wonder if anyone can help me with the following 
I want to have a count down timer to display in (Hours : Min ) a leaving time eg: " that it looks at the traffic conditions and alters the time "sensor.google_travel_time__driving - the current time " so it outputs time to leave in 20 min,19min,18min 17min ect down to 0 min " being struggling for days if anyone has any suggestions
This is the closest i have come {{strptime(“07:15”, “%H:%M”) - strptime(states.sensor.total_travel_time_now.state, “%M”) }} that outputs 06:57:00 not the desired 20min,19min 18min ect every way i have trided just gives me no results