I need an array of recurring dates with time for every week within the start date and end date using moment.js or javascript.

For example: Startdate: 2021-10-04T00:00:00Z Enddate: 2021-10-31T00:00:00Z

let's say 2021-10-05T00:00:00Z is a recurring date then output will be

["2021-10-05T00:00:00Z", "2021-10-12T00:00:00Z", "2021-10-19T00:00:00Z", "2021-10-26T00:00:00Z"]

CodePudding user response：

We can use Date.getUTCDate() and Date.setUTCDate() to advance a date by a number of days, in this case seven.

We can then use a while loop to populate the result array. I'm returning an array of Date objects here, one could use .toISOString() to convert to strings.

let startDate = '2021-10-05T00:00:00Z';
let endDate = '2021-10-31T00:00:00Z';

function getWeeklyDates(start, end) {
    let date = new Date(start);
    const endDate = new Date(end);
    
    const result = [];
    while (date < endDate) {
        result.push(date);
        date = new Date(date);
        date.setUTCDate(date.getUTCDate()   7);
    }
    return result;
}

console.log(getWeeklyDates(startDate, endDate).map(dt => dt.toISOString()))

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CodePudding user response：

You can do this with pure js if you remove the "Z" add " 00:00" to all of your strings to make sure your timezone does not break this code.

let start = "2021-10-04T00:00:00 00:00";
let end = "2021-10-31T00:00:00 00:00";
let date = "2021-10-05T00:00:00 00:00";

start = new Date(start);
end = new Date(end);
date = new Date(date);
    
let dates = [];
if (date < start) {
    console.log("bad input")
} else {
    while (date.getTime() < end.getTime()) {
        dates.push(date.toISOString());
        date = new Date(date.getTime()   604800000); // add a week in milliseconds
    }
}

CodePudding user response：

you can do something like:

• start at the first recurring date
• add a week to the recurring date using .add(1, 'weeks') (see https://momentjs.com/docs/#/manipulating/add/ )
• do this while recurring date < end date