Uptime in seconds?

[Smandurlo]

Is your feature request related to a problem? Please describe.
I am not able to create an uptime sensor in seconds.
It is easier to deal with seconds to create automations.

Describe the solution you'd like
The uptime has a value that is impossible (for me) to change in seconds. For example, in this moment I have up_time: 12 days, 27 min
The file /proc/uptime contains the value in seconds (the first value). To get only the first value awk '{print $1}' /proc/uptime
Maybe you could add another property like up_time_s with that value

Describe alternatives you've considered
If you have a reverse formula to change the actual property up_time in a template sensor, I am very fine with that :-)
At the moment I use a ssh template to my raspberries to get it

[ironsheep]

ok, this is arriving in next release!

[Smandurlo]

I forgot of it :-D after 10 months :-D better later than never :-p

[ironsheep]

Changes committed and now avail. in v1.8.0 and later.