This app was mentioned in 5 comments, with an average of 1.20 upvotes
Countdown on the Web : https://www.timeanddate.com/countdown/launch?iso=20170303T00&p0=268&msg=Nintendo+Switch+Release%21+&font=sanserif
App : https://play.google.com/store/apps/details?id=de.dennis_kempf.webwidget
Use this app and put the URL into the settings when creating the widget. Have fun!
https://play.google.com/store/apps/details?id=de.dennis_kempf.webwidget
Get a website widget like this and make it show a site like nextrocket.space
Haven't tried it, but this might work
https://play.google.com/store/apps/details?id=de.dennis_kempf.webwidget
After some trial and error, Web Widget by Dennis Kempf seems to do what I need it to.