converting data string to time using Linq

How can I convert the following into times, knowing that the values are the number of minutes.

350-659, 1640-2119, 2880-3479;

The output id like is 
M 5:50am - 10:59am
T 3:20am - 10:59am
W 12:00am - 9:59am
etc....

Ranges - 
    Mon= 0-1439
    Tue = 1440-2879
    Wed = 2880 - 4319
    Thurs = 4321 - 5759
    Fri = 5760 - 7199
    Sat = 7200 - 8639
    Sun = 8640 - 10079

What I have so far is

var days = new[] { 24, 48, 72, 96, 120, 144, 168 };
var numbers = Enumerable.Range(1,7);
var hours = days.ToDictionary(x => (double)x/24, i => (int)I*60);

which outputs 
Key     Value
1       1440 
2       2880
3       4320   
4       5760
5       7200 
6       8640
7      10080

Answers:

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Method 1

I kinda don’t get the question at all, but taking everything you’ve said at face value:

var times = "350-659, 1640-2119, 2880-3479;"
  .Split(',')                                                     //split to string pairs like "350-659"
  .Select(s => s.Split('-').Select(x => int.Parse(x)).ToArray())  //split stringpairs to two strings like "350" and "659", then parse to ints and store as an array
  .Select(sa =>  new {                                            //turn array ints into dates
        F = new DateTime(0).AddMinutes(sa[0]),                    //date 0 i.e. jan 1 0001 was a monday. add minutes to it to get a time and day
        T = new DateTime(0).AddMinutes(sa[1] + 1)                 //add 1 to the end minute otherwise 659 is 10:59pm and you want 11:00am
      }
  )

  .Select(t => 
      $"{($"{t.F:ddd}"[0])} {t.F:hh':'mmtt} - {t.T:hh':'mmtt}"    //format the date to a day name and pull the first character, plus format the dates to hh:mmtt format (eg 09:00AM)
  );
    
    Console.Write(string.Join("rn", times));

If you actually want to work with these things in a sensible way I recommend you stop sooner than the final Select, which stringifies them, and work with the anonymous type t that contains a pair of datetimes

The only thing about this output that doesn’t match the spec, is that the AM/PM are uppercase. If that bothers you, consider:

$"{t.F:ddd}"[0] + ($" {t.F:hh':'mmtt} - {t.T:hh':'mmtt}").ToLower()

Method 2

You could get the current monday of the week and add the minutes. I don’t think you can do this in Linq directly.

//your timestamp
int minutes = 2345;

//get the day of week (sunday = 0)
int weekday = (int)DateTime.Now.DayOfWeek - 1;
if (DateTime.Now.DayOfWeek == DayOfWeek.Sunday)
    weekday = 6;

//get the first day of this week
DateTime firstDayOfWeek = DateTime.Now.AddDays(-1 * weekday);

//add the number of minutes
DateTime date = firstDayOfWeek.Date.AddMinutes(minutes);

Method 3

An interval of time (as opposed to an absolute point in time) is expressed as a TimeSpan. In this case, you’d have one TimeSpan that represents the offset (from the beginning of the week) until the starting time, then another TimeSpan that represents the offset to the end time.

Here’s how to convert your string into a series of TimeSpans.

var input = @"540-1019;1980-2459;3420-3899;4860-5339;6300-6779";
var times = input
    .Split(';')
    .Select(item => item.Split('-'))
    .Select(pair => new
    {
        StartTime = new TimeSpan(hours: 0, minutes: int.Parse(pair[0]), seconds: 0),
        EndTime   = new TimeSpan(hours: 0, minutes: int.Parse(pair[1]), seconds: 0)
    })
    .ToList();
foreach (var time in times)
{
    Console.WriteLine
    (
        @"Day: {0} Start: {1:h:mm} End: {2:h:mm}",
        time.StartTime.Days, 
        time.StartTime,
        time.EndTime
    );
}

Output:

Day: 0 Start: 9:00 End: 16:59
Day: 1 Start: 9:00 End: 16:59
Day: 2 Start: 9:00 End: 16:59
Day: 3 Start: 9:00 End: 16:59
Day: 4 Start: 9:00 End: 16:59

You can of course choose to format the TimeSpan in any way you want using the appropriate format string.

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0