Convert milliseconds

With C#, milliseconds, seconds, minutes, hours and days can be converted. These values may be from another data source (like a database or file).

We convert these time units to other time units. We look at C# methods that use TimeSpan, a class that can help us perform these conversions.

Example

The number we are converting is a length of time, not a specific time. These methods internally call TimeSpan.FromMilliseconds, FromSeconds, FromMinutes, FromHours and FromDays.

using System;
using T = TimeSpanUtil;

public static class TimeSpanUtil
{
#region To days
    public static double ConvertMillisecondsToDays(double milliseconds)
    {
        return TimeSpan.FromMilliseconds(milliseconds).TotalDays;
    }

    public static double ConvertSecondsToDays(double seconds)
    {
        return TimeSpan.FromSeconds(seconds).TotalDays;
    }

    public static double ConvertMinutesToDays(double minutes)
    {
        return TimeSpan.FromMinutes(minutes).TotalDays;
    }

    public static double ConvertHoursToDays(double hours)
    {
        return TimeSpan.FromHours(hours).TotalDays;
    }
#endregion

#region To hours
    public static double ConvertMillisecondsToHours(double milliseconds)
    {
        return TimeSpan.FromMilliseconds(milliseconds).TotalHours;
    }

    public static double ConvertSecondsToHours(double seconds)
    {
        return TimeSpan.FromSeconds(seconds).TotalHours;
    }

    public static double ConvertMinutesToHours(double minutes)
    {
        return TimeSpan.FromMinutes(minutes).TotalHours;
    }

    public static double ConvertDaysToHours(double days)
    {
        return TimeSpan.FromHours(days).TotalHours;
    }
#endregion

#region To minutes
    public static double ConvertMillisecondsToMinutes(double milliseconds)
    {
        return TimeSpan.FromMilliseconds(milliseconds).TotalMinutes;
    }

    public static double ConvertSecondsToMinutes(double seconds)
    {
        return TimeSpan.FromSeconds(seconds).TotalMinutes;
    }

    public static double ConvertHoursToMinutes(double hours)
    {
        return TimeSpan.FromHours(hours).TotalMinutes;
    }

    public static double ConvertDaysToMinutes(double days)
    {
        return TimeSpan.FromDays(days).TotalMinutes;
    }
#endregion

#region To seconds
    public static double ConvertMillisecondsToSeconds(double milliseconds)
    {
        return TimeSpan.FromMilliseconds(milliseconds).TotalSeconds;
    }

    public static double ConvertMinutesToSeconds(double minutes)
    {
        return TimeSpan.FromMinutes(minutes).TotalSeconds;
    }

    public static double ConvertHoursToSeconds(double hours)
    {
        return TimeSpan.FromHours(hours).TotalSeconds;
    }

    public static double ConvertDaysToSeconds(double days)
    {
        return TimeSpan.FromDays(days).TotalSeconds;
    }
#endregion

#region To milliseconds
    public static double ConvertSecondsToMilliseconds(double seconds)
    {
        return TimeSpan.FromSeconds(seconds).TotalMilliseconds;
    }

    public static double ConvertMinutesToMilliseconds(double minutes)
    {
        return TimeSpan.FromMinutes(minutes).TotalMilliseconds;
    }

    public static double ConvertHoursToMilliseconds(double hours)
    {
        return TimeSpan.FromHours(hours).TotalMilliseconds;
    }

    public static double ConvertDaysToMilliseconds(double days)
    {
        return TimeSpan.FromDays(days).TotalMilliseconds;
    }
#endregion
}

class Program
{
    static void Main()
    {
        // 500000 milliseconds = 0.00578703704 days
        Console.WriteLine(T.ConvertMillisecondsToDays(500000));

        // 100 hours = 6000 minutes
        Console.WriteLine(T.ConvertHoursToMinutes(100));

        // 10000 days = 240000 hours
        Console.WriteLine(T.ConvertDaysToHours(10000));

        // 500 minutes = 8.33333333 hours
        Console.WriteLine(T.ConvertMinutesToHours(500));

        // 600000 milliseconds = 600 seconds
        Console.WriteLine(T.ConvertMillisecondsToSeconds(600000));
    }
}
0.005787037037037037
6000
10000
8.333333333333334
600

Notes, testing

We can test the results against an Internet search. But given .NET provides these methods, we can rely on its own testing.

Notes, alias syntax

We can use the type alias syntax in the C# language. Many developers dislike this syntax. But this is a good usage of it as it shortens the example.

We converted milliseconds, seconds, minutes, hours, and days to one another. This is useful for databases (as an example) where the time periods are stored in milliseconds.