获取日历天中两个日期之间的差异

Question

can anyone explain how can I get difference between two dates in calendar days, not in whole 24-hour periods. There is a good solution here: Getting the difference between two NSDates in (months/days/hours/minutes/seconds) -- but it doesn't work for me as, for example, it gives the difference between 23:00 today and 1:30 tomorrow as 0 days despite of calendar dates differ already by 1.

Answer 1

Use the normal way to calculate the difference in days with one change - convert both of your dates to midnight.

let d1 = ... // your first date
let d2 = ... // your second date
let cal = Calendar.current
let days = cal.dateComponents([.day], from: cal.startOfDay(for: d1), to: cal.startOfDay(for: d2)).day!

This will give an answer of 1 for "yesterday at 23:00" and "today at 1:30", for example.