How to Compare Time in Pascal

Written by sean mann
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How to Compare Time in Pascal
Pascal can access the system clock for time measurements. (Thinkstock/Comstock/Getty Images)

When dealing with time in Pascal, you calculate the amount of time between two different events. For example, you may want to check long it takes part of a program to run, or see how long someone has been logged in or to track the time during a multiple choice test. Once you collect two different times, you encode them into a numerical form, subtract and then display the time difference.

Skill level:


  1. 1

    Open your Pascal source file in a text editor such as Windows Notepad.

  2. 2

    Type the following code at the top of your file:

    Program Example;

    Uses Dos;

    Uses sysutils;

    Using "Dos" provides access to the "GetTime" function. Using "sysutils" provides access to the "EncodeTime" and "DecodeTime" functions.

  3. 3

    Declare variables that will store the time values by adding the code:


    Hour 1, Min 1, Sec 1, HSec1 : word;

    Hour 2, Min 2, Sec 2, HSec2 : word;

    Hour 3, Min 3, Sec 3, MSec3 : word;

    x, y, z : TDateTime;

  4. 4

    Get the first time at the beginning of your function by adding the code:


    GetTime(Hour 1, Min 1, Sec 1, HSec1);

  5. 5

    Perform the main code of your function and then call "GetTime" again by adding the code:

    GetTime(Hour 2, Min 2, Sec 2, HSec2);

  6. 6

    Compute the difference between the two times by adding the code:

    x := EncodeTime(Hour 1, Min 1, Sec 1, 0);

    y := EncodeTime(Hour 2, Min 2, Sec 2, 0);

    z := y - x;

    DecodeTime(z, Hour 3, Min 3, Sec 3, MSec3);

    The "EncodeTime" function converts the time into a "TDateTime" value, which is stored as a "double." The code subtracts the two times and then decodes the result into a printable format.

  7. 7

    Display the time difference with the "writeln" function by adding the code:

    Writeln (format('Time difference = %d:%d:%d',[Hour3,Min 3,Sec 3]));


  8. 8

    Save your file, compile and run the program to view the time measurements.

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