This app was mentioned in 5 comments, with an average of 1.00 upvote
you have likely looked, but what about an App? https://itunes.apple.com/us/app/days-without-an-incident/id1079620959?mt=8 https://play.google.com/store/apps/details?id=com.min.dayssince&hl=en
I use Since. Unfortunately I can't find it on google play. I guess google took it off?
this one seems fine however: https://play.google.com/store/apps/details?id=com.min.dayssince
Hey, I've used a few and this seems to be the most simple, https://play.google.com/store/apps/details?id=com.min.dayssince