Worked out timespan but need to mins 00:20:00 (HH:mm:ss)











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Using two buttons to start and stop each using a



start_time = Format(Date.Now, "HH:mm:ss") 


or



stop_time = Format(Date.Now, "HH:mm:ss") 


to store the time and when submitting it uses a timespan to calculate the difference which works like a treat



Dim duration As TimeSpan = stop_time - start_time


Say if i recorded 00:59:00 minutes, how would i minus 00:20:00?, im guessing it would be another timespan with duration minus 00:20:00 but not sure how to get the 00:20:00 in a format to use this.



Cheers,
Pete










share|improve this question






















  • Subtraction of dates produces a timespan. Subtraction of timespans also produces a timespan. Are you asking how to manually construct a timespan for 20 minutes?
    – GSerg
    Nov 19 at 11:25












  • Try TimeSpan.FromMinutes(20.0).
    – Enigmativity
    Nov 19 at 11:30






  • 1




    Why are you using strings? Use all TimeSpan types: Dim start_time As TimeSpan = Date.Now.TimeOfDay. A TimeSpan of 20 minutes is Dim SubSpan As TimeSpan = New TimeSpan(0, 20, 0). Then subtract: Dim duration As TimeSpan = stop_time - start_time -> duration = duration - SubSpan
    – Jimi
    Nov 19 at 11:31










  • @Jimi - Why not post that as an answer?
    – Enigmativity
    Nov 19 at 11:32






  • 1




    You should try setting Option Strict On and see what that does to your code. (If you can get past the initial shock it'll make you a better coder.)
    – Enigmativity
    Nov 19 at 11:39















up vote
0
down vote

favorite












Using two buttons to start and stop each using a



start_time = Format(Date.Now, "HH:mm:ss") 


or



stop_time = Format(Date.Now, "HH:mm:ss") 


to store the time and when submitting it uses a timespan to calculate the difference which works like a treat



Dim duration As TimeSpan = stop_time - start_time


Say if i recorded 00:59:00 minutes, how would i minus 00:20:00?, im guessing it would be another timespan with duration minus 00:20:00 but not sure how to get the 00:20:00 in a format to use this.



Cheers,
Pete










share|improve this question






















  • Subtraction of dates produces a timespan. Subtraction of timespans also produces a timespan. Are you asking how to manually construct a timespan for 20 minutes?
    – GSerg
    Nov 19 at 11:25












  • Try TimeSpan.FromMinutes(20.0).
    – Enigmativity
    Nov 19 at 11:30






  • 1




    Why are you using strings? Use all TimeSpan types: Dim start_time As TimeSpan = Date.Now.TimeOfDay. A TimeSpan of 20 minutes is Dim SubSpan As TimeSpan = New TimeSpan(0, 20, 0). Then subtract: Dim duration As TimeSpan = stop_time - start_time -> duration = duration - SubSpan
    – Jimi
    Nov 19 at 11:31










  • @Jimi - Why not post that as an answer?
    – Enigmativity
    Nov 19 at 11:32






  • 1




    You should try setting Option Strict On and see what that does to your code. (If you can get past the initial shock it'll make you a better coder.)
    – Enigmativity
    Nov 19 at 11:39













up vote
0
down vote

favorite









up vote
0
down vote

favorite











Using two buttons to start and stop each using a



start_time = Format(Date.Now, "HH:mm:ss") 


or



stop_time = Format(Date.Now, "HH:mm:ss") 


to store the time and when submitting it uses a timespan to calculate the difference which works like a treat



Dim duration As TimeSpan = stop_time - start_time


Say if i recorded 00:59:00 minutes, how would i minus 00:20:00?, im guessing it would be another timespan with duration minus 00:20:00 but not sure how to get the 00:20:00 in a format to use this.



Cheers,
Pete










share|improve this question













Using two buttons to start and stop each using a



start_time = Format(Date.Now, "HH:mm:ss") 


or



stop_time = Format(Date.Now, "HH:mm:ss") 


to store the time and when submitting it uses a timespan to calculate the difference which works like a treat



Dim duration As TimeSpan = stop_time - start_time


Say if i recorded 00:59:00 minutes, how would i minus 00:20:00?, im guessing it would be another timespan with duration minus 00:20:00 but not sure how to get the 00:20:00 in a format to use this.



Cheers,
Pete







vb.net






share|improve this question













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share|improve this question










asked Nov 19 at 11:15









Peter James

346




346












  • Subtraction of dates produces a timespan. Subtraction of timespans also produces a timespan. Are you asking how to manually construct a timespan for 20 minutes?
    – GSerg
    Nov 19 at 11:25












  • Try TimeSpan.FromMinutes(20.0).
    – Enigmativity
    Nov 19 at 11:30






  • 1




    Why are you using strings? Use all TimeSpan types: Dim start_time As TimeSpan = Date.Now.TimeOfDay. A TimeSpan of 20 minutes is Dim SubSpan As TimeSpan = New TimeSpan(0, 20, 0). Then subtract: Dim duration As TimeSpan = stop_time - start_time -> duration = duration - SubSpan
    – Jimi
    Nov 19 at 11:31










  • @Jimi - Why not post that as an answer?
    – Enigmativity
    Nov 19 at 11:32






  • 1




    You should try setting Option Strict On and see what that does to your code. (If you can get past the initial shock it'll make you a better coder.)
    – Enigmativity
    Nov 19 at 11:39


















  • Subtraction of dates produces a timespan. Subtraction of timespans also produces a timespan. Are you asking how to manually construct a timespan for 20 minutes?
    – GSerg
    Nov 19 at 11:25












  • Try TimeSpan.FromMinutes(20.0).
    – Enigmativity
    Nov 19 at 11:30






  • 1




    Why are you using strings? Use all TimeSpan types: Dim start_time As TimeSpan = Date.Now.TimeOfDay. A TimeSpan of 20 minutes is Dim SubSpan As TimeSpan = New TimeSpan(0, 20, 0). Then subtract: Dim duration As TimeSpan = stop_time - start_time -> duration = duration - SubSpan
    – Jimi
    Nov 19 at 11:31










  • @Jimi - Why not post that as an answer?
    – Enigmativity
    Nov 19 at 11:32






  • 1




    You should try setting Option Strict On and see what that does to your code. (If you can get past the initial shock it'll make you a better coder.)
    – Enigmativity
    Nov 19 at 11:39
















Subtraction of dates produces a timespan. Subtraction of timespans also produces a timespan. Are you asking how to manually construct a timespan for 20 minutes?
– GSerg
Nov 19 at 11:25






Subtraction of dates produces a timespan. Subtraction of timespans also produces a timespan. Are you asking how to manually construct a timespan for 20 minutes?
– GSerg
Nov 19 at 11:25














Try TimeSpan.FromMinutes(20.0).
– Enigmativity
Nov 19 at 11:30




Try TimeSpan.FromMinutes(20.0).
– Enigmativity
Nov 19 at 11:30




1




1




Why are you using strings? Use all TimeSpan types: Dim start_time As TimeSpan = Date.Now.TimeOfDay. A TimeSpan of 20 minutes is Dim SubSpan As TimeSpan = New TimeSpan(0, 20, 0). Then subtract: Dim duration As TimeSpan = stop_time - start_time -> duration = duration - SubSpan
– Jimi
Nov 19 at 11:31




Why are you using strings? Use all TimeSpan types: Dim start_time As TimeSpan = Date.Now.TimeOfDay. A TimeSpan of 20 minutes is Dim SubSpan As TimeSpan = New TimeSpan(0, 20, 0). Then subtract: Dim duration As TimeSpan = stop_time - start_time -> duration = duration - SubSpan
– Jimi
Nov 19 at 11:31












@Jimi - Why not post that as an answer?
– Enigmativity
Nov 19 at 11:32




@Jimi - Why not post that as an answer?
– Enigmativity
Nov 19 at 11:32




1




1




You should try setting Option Strict On and see what that does to your code. (If you can get past the initial shock it'll make you a better coder.)
– Enigmativity
Nov 19 at 11:39




You should try setting Option Strict On and see what that does to your code. (If you can get past the initial shock it'll make you a better coder.)
– Enigmativity
Nov 19 at 11:39












1 Answer
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0
down vote













As of now, you're using strings to store DateTime values. There's no reason for it.

Strings should be used - when dealing with DateTime structure - for presentation only.

Use a TimeSpan to perform these calculations.



Store the start time of an operation:



Dim StartTime As TimeSpan = Date.Now.TimeOfDay


Store the end time of an operation:



Dim StopTime As TimeSpan = Date.Now.TimeOfDay


Calculate the Duration:



 Dim Duration As TimeSpan = StopTime - StartTime


A TimeSpan value can be created with:



[TimeSpan] = new TimeSpan([Hours], [Minutes], [Seconds]) or:
[TimeSpan] = TimeSpan.FromSeconds([Seconds]) | TimeSpan.FromMinutes([Minutes]) | .FromHours([Hours]) etc.



Note that the first form accepts Integer values, while the second form accepts Double values: when inserting the value in minutes, add a # to the value (indicating that the value is a Double type) and see what happens.



Create a new TimeSpan of 20 minutes and subtract it from the Duration value:



Dim SubSpan As TimeSpan = New TimeSpan(0, 20, 0)
'Or
Dim SubSpan As TimeSpan = TimeSpan.FromMinutes(20.0#)

Duration -= SubSpan


Use the TimeSpan.ToString() method to present the DateTime / TimeSpan value in a human readable, localized, form:



TextBox1.Text = Duration.ToString()


Or using a specific format:



TextBox1.Text = duration.ToString("hh:mm:ss")
TextBox1.Text = duration.ToString("hh:mm:ss", CultureInfo.InvariantCulture)
TextBox1.Text = duration.ToString("hh:mm:ss", CultureInfo.CreateSpecificCulture("en-UK"))



As noted in the comments (and in many other questions every day), it would be
a great idea to set Option Strict On, possibly Option Explicit On
and (it can be really useful) Option Infer On in the Project properties.
This will help a lot in making the right decision when declaring and using your Types.







share|improve this answer























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    up vote
    0
    down vote













    As of now, you're using strings to store DateTime values. There's no reason for it.

    Strings should be used - when dealing with DateTime structure - for presentation only.

    Use a TimeSpan to perform these calculations.



    Store the start time of an operation:



    Dim StartTime As TimeSpan = Date.Now.TimeOfDay


    Store the end time of an operation:



    Dim StopTime As TimeSpan = Date.Now.TimeOfDay


    Calculate the Duration:



     Dim Duration As TimeSpan = StopTime - StartTime


    A TimeSpan value can be created with:



    [TimeSpan] = new TimeSpan([Hours], [Minutes], [Seconds]) or:
    [TimeSpan] = TimeSpan.FromSeconds([Seconds]) | TimeSpan.FromMinutes([Minutes]) | .FromHours([Hours]) etc.



    Note that the first form accepts Integer values, while the second form accepts Double values: when inserting the value in minutes, add a # to the value (indicating that the value is a Double type) and see what happens.



    Create a new TimeSpan of 20 minutes and subtract it from the Duration value:



    Dim SubSpan As TimeSpan = New TimeSpan(0, 20, 0)
    'Or
    Dim SubSpan As TimeSpan = TimeSpan.FromMinutes(20.0#)

    Duration -= SubSpan


    Use the TimeSpan.ToString() method to present the DateTime / TimeSpan value in a human readable, localized, form:



    TextBox1.Text = Duration.ToString()


    Or using a specific format:



    TextBox1.Text = duration.ToString("hh:mm:ss")
    TextBox1.Text = duration.ToString("hh:mm:ss", CultureInfo.InvariantCulture)
    TextBox1.Text = duration.ToString("hh:mm:ss", CultureInfo.CreateSpecificCulture("en-UK"))



    As noted in the comments (and in many other questions every day), it would be
    a great idea to set Option Strict On, possibly Option Explicit On
    and (it can be really useful) Option Infer On in the Project properties.
    This will help a lot in making the right decision when declaring and using your Types.







    share|improve this answer



























      up vote
      0
      down vote













      As of now, you're using strings to store DateTime values. There's no reason for it.

      Strings should be used - when dealing with DateTime structure - for presentation only.

      Use a TimeSpan to perform these calculations.



      Store the start time of an operation:



      Dim StartTime As TimeSpan = Date.Now.TimeOfDay


      Store the end time of an operation:



      Dim StopTime As TimeSpan = Date.Now.TimeOfDay


      Calculate the Duration:



       Dim Duration As TimeSpan = StopTime - StartTime


      A TimeSpan value can be created with:



      [TimeSpan] = new TimeSpan([Hours], [Minutes], [Seconds]) or:
      [TimeSpan] = TimeSpan.FromSeconds([Seconds]) | TimeSpan.FromMinutes([Minutes]) | .FromHours([Hours]) etc.



      Note that the first form accepts Integer values, while the second form accepts Double values: when inserting the value in minutes, add a # to the value (indicating that the value is a Double type) and see what happens.



      Create a new TimeSpan of 20 minutes and subtract it from the Duration value:



      Dim SubSpan As TimeSpan = New TimeSpan(0, 20, 0)
      'Or
      Dim SubSpan As TimeSpan = TimeSpan.FromMinutes(20.0#)

      Duration -= SubSpan


      Use the TimeSpan.ToString() method to present the DateTime / TimeSpan value in a human readable, localized, form:



      TextBox1.Text = Duration.ToString()


      Or using a specific format:



      TextBox1.Text = duration.ToString("hh:mm:ss")
      TextBox1.Text = duration.ToString("hh:mm:ss", CultureInfo.InvariantCulture)
      TextBox1.Text = duration.ToString("hh:mm:ss", CultureInfo.CreateSpecificCulture("en-UK"))



      As noted in the comments (and in many other questions every day), it would be
      a great idea to set Option Strict On, possibly Option Explicit On
      and (it can be really useful) Option Infer On in the Project properties.
      This will help a lot in making the right decision when declaring and using your Types.







      share|improve this answer

























        up vote
        0
        down vote










        up vote
        0
        down vote









        As of now, you're using strings to store DateTime values. There's no reason for it.

        Strings should be used - when dealing with DateTime structure - for presentation only.

        Use a TimeSpan to perform these calculations.



        Store the start time of an operation:



        Dim StartTime As TimeSpan = Date.Now.TimeOfDay


        Store the end time of an operation:



        Dim StopTime As TimeSpan = Date.Now.TimeOfDay


        Calculate the Duration:



         Dim Duration As TimeSpan = StopTime - StartTime


        A TimeSpan value can be created with:



        [TimeSpan] = new TimeSpan([Hours], [Minutes], [Seconds]) or:
        [TimeSpan] = TimeSpan.FromSeconds([Seconds]) | TimeSpan.FromMinutes([Minutes]) | .FromHours([Hours]) etc.



        Note that the first form accepts Integer values, while the second form accepts Double values: when inserting the value in minutes, add a # to the value (indicating that the value is a Double type) and see what happens.



        Create a new TimeSpan of 20 minutes and subtract it from the Duration value:



        Dim SubSpan As TimeSpan = New TimeSpan(0, 20, 0)
        'Or
        Dim SubSpan As TimeSpan = TimeSpan.FromMinutes(20.0#)

        Duration -= SubSpan


        Use the TimeSpan.ToString() method to present the DateTime / TimeSpan value in a human readable, localized, form:



        TextBox1.Text = Duration.ToString()


        Or using a specific format:



        TextBox1.Text = duration.ToString("hh:mm:ss")
        TextBox1.Text = duration.ToString("hh:mm:ss", CultureInfo.InvariantCulture)
        TextBox1.Text = duration.ToString("hh:mm:ss", CultureInfo.CreateSpecificCulture("en-UK"))



        As noted in the comments (and in many other questions every day), it would be
        a great idea to set Option Strict On, possibly Option Explicit On
        and (it can be really useful) Option Infer On in the Project properties.
        This will help a lot in making the right decision when declaring and using your Types.







        share|improve this answer














        As of now, you're using strings to store DateTime values. There's no reason for it.

        Strings should be used - when dealing with DateTime structure - for presentation only.

        Use a TimeSpan to perform these calculations.



        Store the start time of an operation:



        Dim StartTime As TimeSpan = Date.Now.TimeOfDay


        Store the end time of an operation:



        Dim StopTime As TimeSpan = Date.Now.TimeOfDay


        Calculate the Duration:



         Dim Duration As TimeSpan = StopTime - StartTime


        A TimeSpan value can be created with:



        [TimeSpan] = new TimeSpan([Hours], [Minutes], [Seconds]) or:
        [TimeSpan] = TimeSpan.FromSeconds([Seconds]) | TimeSpan.FromMinutes([Minutes]) | .FromHours([Hours]) etc.



        Note that the first form accepts Integer values, while the second form accepts Double values: when inserting the value in minutes, add a # to the value (indicating that the value is a Double type) and see what happens.



        Create a new TimeSpan of 20 minutes and subtract it from the Duration value:



        Dim SubSpan As TimeSpan = New TimeSpan(0, 20, 0)
        'Or
        Dim SubSpan As TimeSpan = TimeSpan.FromMinutes(20.0#)

        Duration -= SubSpan


        Use the TimeSpan.ToString() method to present the DateTime / TimeSpan value in a human readable, localized, form:



        TextBox1.Text = Duration.ToString()


        Or using a specific format:



        TextBox1.Text = duration.ToString("hh:mm:ss")
        TextBox1.Text = duration.ToString("hh:mm:ss", CultureInfo.InvariantCulture)
        TextBox1.Text = duration.ToString("hh:mm:ss", CultureInfo.CreateSpecificCulture("en-UK"))



        As noted in the comments (and in many other questions every day), it would be
        a great idea to set Option Strict On, possibly Option Explicit On
        and (it can be really useful) Option Infer On in the Project properties.
        This will help a lot in making the right decision when declaring and using your Types.








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        edited Nov 19 at 17:38

























        answered Nov 19 at 12:36









        Jimi

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