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VB.NET TimeSpan ExamplesUse TimeSpan to indicate ranges of time in days, hours, and other units.
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TimeSpan. This .NET type represents a period of time. With it we use a host of helper functions to make managing time periods easier.
TimeSpan benefits. TimeSpan leads to simpler, more reliable VB.NET programs that act upon time representations. We can use helpful methods on TimeSpan.
Constructor. The TimeSpan type has many useful constructors. These allow you to specify the exact period of time you want the TimeSpan to represent.
Here In this example, we specify a TimeSpan of one day, two hours, and 1 minute.
Tip Arguments to the TimeSpan constructor are ordered from largest unit of time to smallest.
VB.NET program that uses constructor
Module Module1 Sub Main() ' Use the TimeSpan constructor. ' ... Days, hours, minutes, seconds, milliseconds. Dim span As TimeSpan = New TimeSpan(1, 2, 1, 0, 0) Console.WriteLine(span) End Sub End Module
1.02:01:00
TimeSpan.From. We can create a new TimeSpan instance in another way. The From functions allow you to specify a unit to create the TimeSpan from.
So You can specify days, hours, minutes, seconds or milliseconds and get a TimeSpan.
VB.NET program that uses From functions
Module Module1 Sub Main() ' Get TimeSpan instances from a specific unit of time. Dim span1 As TimeSpan = TimeSpan.FromDays(1) Dim span2 As TimeSpan = TimeSpan.FromHours(1) Dim span3 As TimeSpan = TimeSpan.FromMinutes(1) Dim span4 As TimeSpan = TimeSpan.FromSeconds(1) Dim span5 As TimeSpan = TimeSpan.FromMilliseconds(1) Console.WriteLine(span1) Console.WriteLine(span2) Console.WriteLine(span3) Console.WriteLine(span4) Console.WriteLine(span5) End Sub End Module
1.00:00:00 01:00:00 00:01:00 00:00:01 00:00:00.0010000
Add, Subtract. The TimeSpan type allows us to add and subtract instances. We can compute the total time or the difference between 2 TimeSpan instances.
VB.NET program that uses Add, Subtract
Module Module1 Sub Main() ' Input TimeSpans. Dim span1 As TimeSpan = TimeSpan.FromMinutes(1) Dim span2 As TimeSpan = TimeSpan.FromMinutes(2) ' Add. Dim span3 As TimeSpan = span1.Add(span2) Console.WriteLine(span3) ' Subtract. Dim span4 As TimeSpan = span2.Subtract(span1) Console.WriteLine(span4) End Sub End Module
00:03:00 00:01:00
Max, Min. On TimeSpan we can use the MaxValue, MinValue, and Zero constants. These return a TimeSpan instance that has been initialized to a special value.
And In many programs, you can use the TimeSpan.Zero constant as a default value for a TimeSpan.
VB.NET program that uses Max, Min and Zero
Module Module1 Sub Main() ' Maximum, minimum, zero values. Console.WriteLine(TimeSpan.MaxValue) Console.WriteLine(TimeSpan.MinValue) Console.WriteLine(TimeSpan.Zero) End Sub End Module
10675199.02:48:05.4775807 -10675199.02:48:05.4775808 00:00:00
TicksPer. How can you convert ticks to other units of time? You can use the TimeSpan.TicksPer constants. These are on the TimeSpan type.
VB.NET program that uses TicksPer constants
Module Module1 Sub Main() ' Display these constants. Console.WriteLine(TimeSpan.TicksPerDay) Console.WriteLine(TimeSpan.TicksPerHour) Console.WriteLine(TimeSpan.TicksPerMinute) Console.WriteLine(TimeSpan.TicksPerSecond) Console.WriteLine(TimeSpan.TicksPerMillisecond) End Sub End Module
864000000000 36000000000 600000000 10000000 10000
Duration. If you subtract a larger TimeSpan from a smaller TimeSpan, your result will be negative. You can then invoke Duration() to see the difference.
VB.NET program that uses Duration function
Module Module1 Sub Main() ' Convert this negative TimeSpan into a positive TimeSpan. Dim span As TimeSpan = New TimeSpan(-1, -1, -1) Dim duration As TimeSpan = span.Duration() Console.WriteLine(duration) End Sub End Module
01:01:01
Hours, TotalHours. The Hours returns the hours part of the TimeSpan. The TotalHours returns the entire TimeSpan represented by Hours.
Note The other Total properties on TimeSpan follow this same pattern. They represent the total time, not just a unit of it.
VB.NET program that uses Hours and TotalHours
Module Module1 Sub Main() ' Compare Hours and TotalHours. Dim span As TimeSpan = New TimeSpan(0, 500, 0, 0, 0) Console.WriteLine(span.Hours) Console.WriteLine(span.TotalHours) End Sub End Module
20 500
A summary. TimeSpans are extremely useful in a wide variety of programs. We can use them to compute durations, and differences between 2 points in time.
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