如何根据C＃中的星期几确定当前时间是否在重复发生的时间范围内？

Question

Not sure how to approach this. I have an app where users can select a time range (say 5:00 PM to 10:00 AM) that repeats daily based on the days selected by the user (say Mon, Thurs, and Sat). How can I determine if the current time is within one of these ranges?

Edit:

I took a look at Find if current time falls in a time range , but I don't think this is a duplicate because it doesn't address the issue I am getting confused on. For example, I'm not sure what to do when a time range falls into the next day. Like in my example, how would I handle 5:00 PM to 10:00 AM the next day ? What about when it falls into the next week like from Sat to Sun (which would be 6 to 0)?

More Info:

I am not working with DateTime objects, I am working with the DaysOfWeek enum and and Timespans to represent the time. Below is a representation of the ranges I would be working with:

| startDay | startTime | endDay |  endTime  |
|----------|-----------|--------|-----------|
|    1     | 17:00:00  |   2    | 09:00:00  |
|    3     | 09:00:00  |   3    | 17:00:00  |
|    6     | 17:00:00  |   0    | 09:00:00  |

Answer 1

Assuming a Sunday start-of-week:

var now = DateTime.Now;

// offset from "Sunday"
var i = now.Date.AddDays(-(double) now.DayOfWeek);
// normalize to this week
var s = i.AddDays((double) startDay).AddHours(startTime.TotalHours);
// normalize to this week
var e = i.AddDays((double)((endDay < startDay) ? endDay + 7 : endDay)).AddHours(endTime.TotalHours);
Debug.Assert(now >= s && now <= e);