This app was mentioned in 5 comments, with an average of 2.40 upvotes
https://play.google.com/store/apps/details?id=de.leihwelt.android.daysleft i use this. Set the date to today or a day in the past and it will count up instead of down. You can have multiple and name them
I've been using Days Left Widget for as long as I remember. It may be not as pleasant to the eye as other apps, but I like you can set various widget sizes. And it just works.
Awesome! I've been using a widget called days left widget. It's simple and compact, but I might just have to switch once I book my flight. The name alone is epic! Da da da... da da da da da...da da da... da da da da da da....
https://play.google.com/store/apps/details?id=de.leihwelt.android.daysleft
I use this https://play.google.com/store/apps/details?id=de.leihwelt.android.daysleft&hl=en
simple but works for me. Everytime I unlock my phone it's on my homescreen. You may find other apps that you like more :)