Float values need to be rounded after 0.59, as like seconds

Here's a script, that will add all the Float values entered in input fields. But I am getting a problem at ROUNDING THE VALUE. With my script, Value before decimal point is rounding off after 0.99(like Price of an item). but I want to round off the value after 0.59(like minutes).

When the Calculate button is clicked, the value will be displayed in another input field.

function add_number() {
var first = parseFloat(document.getElementById("sunday").value);
var second = parseFloat(document.getElementById("monday").value);
var third = parseFloat(document.getElementById("tuesday").value);
var forth = parseFloat(document.getElementById("wednesday").value);
var fifth = parseFloat(document.getElementById("thursday").value);
var sixth = parseFloat(document.getElementById("friday").value);
var seventh = parseFloat(document.getElementById("saturday").value);
var rsl = first + second + third + forth + fifth + sixth + seventh;
document.getElementById("txtresult").value = rsl.toFixed(2);
}

<input type="number" name="sunhrs" id="sunday" />
<input type="number" name="monhrs" id="monday" />
<input type="number" name="tuesday" id="tuesday" />
<input type="number" name="wedhrs" id="wednesday" />
<input type="number" name="thurshrs" id="thursday" />
<input type="number" name="frihrs" id="friday" />
<input type="number" name="sathrs" id="saturday" />

<button onclick="add_number()">Calculate</button>
<br>
<br>
<input type="number" name="txtresult" id="txtresult" />

Example: If I entered 1.50,1.50 in input fields and click on calculate button the output will be 3.00 as the value is rounded off after 0.99. but i want the value rounded after 0.59 So, that the output will be 3.40.

Thanks in advance.

EDITED: The first problem in the post (it was befaore I change); the word "result" is special for JavaScript and I have not use it for a variable name.

Secondly, forgot to add element which has an id is txtresult

;) thx your attention.

1.70

1.5 + 1.5

3.0

3.4

1 Answer
1

In order to add these values together the way you want, you'll need to convert your inputs to fractional hours, and then convert back from fractional hours to the desired representation. JavaScript does not have an "hours" data structure built in. The JavaScript Number type has a decimal base, so it can only work like regular decimal numbers.

Number

e.g.

var first = hoursFromString(document.getElementById("sunday").value);
//etc.


then

document.getElementById("txtresult").value = stringFromHours(result);


If you need help writing hoursFromString or stringFromHours, please update your question with more information on the part you're having trouble with.

hoursFromString

stringFromHours

1.5

Number

"1.50"

Number

1.8333333333333335

3.666666666666667

"3hr 40min"

if(b>0.59) { a=a+1; } else a;

+

1.5 + 1.5

3.0

addHours()

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