How can I tell if DateTime.Now() is on a day AFTER a different DateTime

Question

I\'m running this on flutter, but I guess this could be a more general issue.

I am saving a DateTime in the preferences. I want to be able to then tell if DateTime

Answer 1

I don't know flutter, but my approach would be to not store the last check, but store the date at which the next check should occur. So when you perform a check you calculate the next midnight and store that. Now you can use isAfter.

In javascript this would look something like this:

const now = new Date();

//this also handles overflow into the next month
const nextCheck = new Date(now.getYear(), now.getMonth(), now.getDate() + 1)

//store nextCheck somewhere

//in js there is no isAfter, you just use >
if(new Date() > nextCheck) {
   //do the thing
}

of course you could also calculate nextCheck every time you want to compare it, but I dislike performing the same calculation over and over if I can avoid it.

A thing to mention here is timezones, depending on your date library and if your system and user timezones align, you may need to shift the date.