## Calculate total minutes in list of datetime

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I have list of Appointment class. In below code;

• appointment1,appointment2 and appointment3 are intersect.
• appointment4 and appointment5 are intersect.
• appointment6 is non intersect
• appointment1,appointment2 and appointment3 start datetime is '2018-07-10 08:00:00' and finish datetime is '2018-07-10 12:00:00' and total time is 4 hours here.
• appointment4 and appointment5 start datetime is '2018-07-10 14:00:00' and finishdatetime is '2018-07-10 17:00:00' and total time is 3 hours here.
• and appointment6 is non intersect comes 1 hour here.

And total time is 4+3+1=8,

How can i find 8 in given Appointment datetime values.

```    class Program
{
static void Main(string[] args)
{
List<Appointment> appointments = new List<Appointment>();

Appointment appointment1 = new Appointment();
appointment1.StartDate = new DateTime(2018, 07, 11, 08, 00, 00);
appointment1.FinishDate = new DateTime(2018, 07, 11, 11, 00, 00);

Appointment appointment2 = new Appointment();
appointment2.StartDate = new DateTime(2018, 07, 11, 10, 00, 00);
appointment2.FinishDate = new DateTime(2018, 07, 11, 12, 00, 00);

Appointment appointment3 = new Appointment();
appointment3.StartDate = new DateTime(2018, 07, 11, 09, 00, 00);
appointment3.FinishDate = new DateTime(2018, 07, 11, 12, 00, 00);

Appointment appointment4 = new Appointment();
appointment4.StartDate = new DateTime(2018, 07, 11, 14, 00, 00);
appointment4.FinishDate = new DateTime(2018, 07, 11, 16, 00, 00);

Appointment appointment5 = new Appointment();
appointment5.StartDate = new DateTime(2018, 07, 11, 15, 00, 00);
appointment5.FinishDate = new DateTime(2018, 07, 11, 17, 00, 00);

Appointment appointment6 = new Appointment();
appointment6.StartDate = new DateTime(2018, 07, 11, 18, 00, 00);
appointment6.FinishDate = new DateTime(2018, 07, 11, 19, 00, 00);

appointments.Add(appointment1);
appointments.Add(appointment2);
appointments.Add(appointment3);
appointments.Add(appointment4);
appointments.Add(appointment5);
appointments.Add(appointment6);

Console.ReadLine();
}
}
public class Appointment
{
public DateTime StartDate { get; set; }
public DateTime FinishDate { get; set; }
}
```

You first need to merge the overlapping times and then sum the timespan:

```void Main()
{
List<Appointment> appointments = new List<Appointment>();

Appointment appointment1 = new Appointment();
appointment1.StartDate = new DateTime(2018, 07, 11, 08, 00, 00);
appointment1.FinishDate = new DateTime(2018, 07, 11, 11, 00, 00);

Appointment appointment2 = new Appointment();
appointment2.StartDate = new DateTime(2018, 07, 11, 10, 00, 00);
appointment2.FinishDate = new DateTime(2018, 07, 11, 12, 00, 00);

Appointment appointment3 = new Appointment();
appointment3.StartDate = new DateTime(2018, 07, 11, 09, 00, 00);
appointment3.FinishDate = new DateTime(2018, 07, 11, 12, 00, 00);

Appointment appointment4 = new Appointment();
appointment4.StartDate = new DateTime(2018, 07, 11, 14, 00, 00);
appointment4.FinishDate = new DateTime(2018, 07, 11, 16, 00, 00);

Appointment appointment5 = new Appointment();
appointment5.StartDate = new DateTime(2018, 07, 11, 15, 00, 00);
appointment5.FinishDate = new DateTime(2018, 07, 11, 17, 00, 00);

Appointment appointment6 = new Appointment();
appointment6.StartDate = new DateTime(2018, 07, 11, 18, 00, 00);
appointment6.FinishDate = new DateTime(2018, 07, 11, 19, 00, 00);

appointments.Add(appointment1);
appointments.Add(appointment2);
appointments.Add(appointment3);
appointments.Add(appointment4);
appointments.Add(appointment5);
appointments.Add(appointment6);

var ranges = appointments.Select(a => new Range {Start=a.StartDate, End=a.FinishDate});
var total = MergeTimes(ranges).Sum(a => (a.End-a.Start).TotalHours);
Console.WriteLine(total);
}

public class Appointment
{
public DateTime StartDate { get; set; }
public DateTime FinishDate { get; set; }

}

public class Range
{
public DateTime Start {get;set;}
public DateTime End {get;set;}
}

public IEnumerable<Range> MergeTimes(IEnumerable<Range> times)
{
if (times.Count() == 0)
{
return times;
}
Range[] orderedTimes = (from t in times
orderby t.Start
select t).ToArray();
List<Range> merged = new List<Range>();
Range current = new Range
{
Start = orderedTimes[0].Start,
End = orderedTimes[0].End
};
for (int i = 0; i < orderedTimes.Length; i++)
{
if (current.Start <= orderedTimes[i].End && current.End >= orderedTimes[i].Start)
{
current.Start = ((current.Start < orderedTimes[i].Start) ? current.Start : orderedTimes[i].Start);
current.End = ((current.End > orderedTimes[i].End) ? current.End : orderedTimes[i].End);
}
else
{
merged.Add(new Range
{
Start = current.Start,
End = current.End
});
current = new Range
{
Start = orderedTimes[i].Start,
End = orderedTimes[i].End
};
}
}
merged.Add(new Range
{
Start = current.Start,
End = current.End
});
return merged;
}
```

c# - Calculate total minutes in list of datetime, You first need to merge the overlapping times and then sum the timespan: void Main() { List<Appointment> appointments = new  The Generic Formula to calculate the minutes between two times is: (END TIME - START TIME)*1440 We subtract time/dates in excel to get the number of days. Since a day has 1440 (24*60) minutes, we multiply the result by 1440 to get the exact number of minutes.

Let's sort the appointments and then `Aggregate` them: we have only 3 choices to implement:

1. Appointments disjoint
2. Appointment includes the next appointment
3. Appointments overlap

Sample code:

```  var total = appointments
.OrderBy(appointment => appointment.StartDate)
.Aggregate(new Tuple<double, DateTime?>(0.0, null), (acc, item) => {
if (!acc.Item2.HasValue || acc.Item2.Value <= item.StartDate) // Disjoint
return new Tuple<double, DateTime?>(
acc.Item1 + (item.FinishDate - item.StartDate).TotalHours,
item.FinishDate);
else if (acc.Item2.Value >= item.FinishDate) // Include
return acc;
else // Partially overlap
return new Tuple<double, DateTime?>(
acc.Item1 + (item.FinishDate - acc.Item2.Value).TotalHours,
item.FinishDate);
})
.Item1;

// 8
Console.WriteLine(total);
```

Get difference in Minutes for DateTime format column, According to this link it should be easy. Try this: =([COLUMN2] - [COLUMN1])*​1440. This will return the total number of minutes between the two dates. UPDATE. Duration Between Two Dates – Calculates number of days. Date Calculator – Add or subtract days, months, years. Birthday Calculator – Find when you are 1 billion seconds old. Date/calendar related services – Overview. Calendar Generator – Create a calendar for any year. The World Clock – Current time all over the world.

Are you aware of the properties on the TimeSpan class?

```(dateA - dateB).TotalMinutes
```

https://msdn.microsoft.com/en-us/library/system.timespan.totalminutes.aspx

Calculate Minutes Between Date & Time In Microsoft Excel, Calculate the exact minutes by subtracting two dates in excel 2016. less 30 minutes for lunch and have the results for each employee you add total up in "If you don't see a custom format already listed, just type it into the box above the list​. Get difference in Minutes for DateTime format column. Total minutes between two times (1735) Calculate time difference with 4 date time columns. 1.

One way to solve this would be to gather the hours that are covered by appointments, then group them.

You could add a method to the `Appointment` class to get the hours covered by the appointment:

```public IEnumerable<int> GetHours()
{
List<int> hours = new List<int>();
var startDate = StartDate;
var finishDate = FinishDate;
while(startDate < finishDate)
{
hours.Add(startDate.Hour);
startDate = startDate.AddHours(1);
}
return hours;
}
```

You can then group them:

```var result = appointments.SelectMany(a => a.GetHours()).GroupBy(i => i);

Console.WriteLine("Total hours: {0}", result.Count()); //This is the count
foreach (var hour in result)
{
Console.WriteLine("{0} => {1}", hour.Key, hour.Count());
}
```

Output in console:

```Total hours: 8
8 => 1
9 => 2
10 => 3
11 => 2
14 => 1
15 => 2
16 => 1
18 => 1
```

Add or subtract time - Excel - office support, Excel can calculate how many hours and minutes (the amount of time) it will take to complete two In the Format Cells box, choose Custom in the Category list. Hello All, I have data that shows the when a rep enters a mall (In) and leaves a mall (Out) I would like to be able to calculate how long the rep spends within a mall in minutes. The data looks like this Rep Location Status Date Time Rep 1 Massey Mall In 2016/11/1 8:20 Rep 2 Crown Mall In

Calculate the difference between two times - Excel, There are several ways to calculate the difference between two times. Total minutes between two times (295). =(B2-A2)*86400. Total seconds between two  To get the total seconds between two times, you multiply the time difference by 86400, which is the number of seconds in one day (24 hours * 60 minutes * 60 seconds = 86400). =(End time - Start time) * 86400 In our example, the formula is as follows: =(B2-A2)* 86400

Calculate minutes between two dates in C#, Firstly, set the two dates. DateTime date1 = new DateTime(2018, 7, 15, 08, 15, 20​); DateTime date2 = new DateTime(2018, 8, 17, 11, 14, 25);  Use the current date time 20180614 15:16 with the previous item to get the total minutes lapsed from 7:00 am to 15:16 pm I really apreciate your help with this issue Solved!

Python, The timedelta class stores the difference between two datetime objects. To find the difference between two dates in form of minutes, the attribute seconds of ConciseDateFormatter class in Python · Python | Sort list of dates given as strings​  The timedelta class stores the difference between two datetime objects. To find the difference between two dates in form of minutes, the attribute seconds of timedelta object can be used which can be further divided by 60 to convert to minutes. Example 1: The following program takes two datetime objects and finds the difference between them in minutes.