I am trying to run a for loop that has to loop 8 times. On each iteration I want the loop to increment the value by +1 hour.
The final output should be in this time format:
opening hours: 08:00, 09:00, 10:00,11:00, 12:00, 13:00, 14:00, 15:00,16:00
In this case timediff mentioned in the for...loop holds the value of 8.
var minutesToAdd = 60;
var currentDate = new Date("2022-04-10 08:00:00");
var futureDate = new Date(currentDate.getTime() + minutesToAdd * 120000).toLocaleTimeString();
for (let i = 0; i < timeDiff; i++) {
console.log(futureDate, 'futureeee date');
}Your code never updates futureDate in the loop. Also, when you expect to print 08:00 in the example, you should print currentDate when no minutes have been added yet.
I would also suggest you use the native function setMinutes and getMinutes to add a number of minutes to a date object.
You say that timeDiff has a value of 8, but then you say you want 9 outputs (8:00 ... 16:00), so you'll need an additional iteration.
Finally, to get the hh:mm output format, there are several solutions. One is to choose a locale that uses a format that is close to what you need, and express you want the short format (without seconds):
let timeDiff = 9; // One more to also output 16:00
let minutesToAdd = 60;
let currentDate = new Date("2022-04-10 08:00:00");
for (let i = 0; i < timeDiff; i++) {
console.log(currentDate.toLocaleTimeString("en-SE", { timeStyle: "short" }));
currentDate.setMinutes(currentDate.getMinutes() + minutesToAdd);
}You can then use a simple for-loop to iterate from 0 up to and including timeDiff, incrementing each iteration by 1.
for (let hours = 0; hours <= timeDiff; hours += 1) {
// ...
}
Instead of a starting date we'll start with a timestamp Date.parse("2022-04-10 08:00:00"). This allows us to add the time from the loop to the timestamp and create a new date.
const date = new Date(currentTimestamp + hours*HOURS);
To only display the time I've taken the liberty of using the solution provided by the answer of trincot.
const MILLISECOND = 1 , MILLISECONDS = MILLISECOND;
const SECOND = 1000*MILLISECONDS, SECONDS = SECOND ;
const MINUTE = 60*SECONDS , MINUTES = MINUTE ;
const HOUR = 60*MINUTES , HOURS = HOUR ;
const timeDiff = 8;
var currentTimestamp = Date.parse("2022-04-10 08:00:00");
for (let hours = 0; hours <= timeDiff; hours += 1) {
const date = new Date(currentTimestamp + hours*HOURS);
console.log(date.toLocaleString(undefined, { timeStyle: "short" }));
}