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Stefan Cutajar
7,747 Pointsconverting to hours
Hi , I know this maybe out of subject but was wondering if you want to add time together like 2.25hrs + 8.40hrs that will add up to 10.65. Is it possible to make the decimal start another number after .60? Thanks
2 Answers
Steven Parker
229,732 PointsFloating math doesn't work like that, but you could rescale the fractional part to become actual decimal hours, do the math and then scale it back for display:
var hours = d => Math.trunc(d) + (d - Math.trunc(d)) * 5 / 3; // convert to decimal hours
var homin = h => Math.trunc(h) + (h - Math.trunc(h)) * 3 / 5; // convert to hours.minutes
console.log(homin(hours(2.25) + hours(8.40))); // shows 11.05
Also, JavaScript has a "Date" object that stores and manipulates time and date as a number of milliseconds:
var showTime = t => `${t.getHours()}:${('0' + t.getMinutes()).slice(-2)}`;
var start = new Date(); // start with the current date & time
start.setHours(2, 25, 0, 0); // set specific time
console.log(showTime(start)); // shows "2:25"
var then = new Date(start.getTime() + ((8 * 60) + 30) * 60000); // add 8 hours and 30 minutes (in ms)
console.log(showTime(then)); // shows "10:05"
Here's a short tutorial on date and time.
Stefan Cutajar
7,747 PointsThanks for your time. Looks like I need a bit more experience so I can understand this better