Author: John Au-Yeung

Sometimes, we want to enumerate dates between two dates in Moment and JavaScript.

In this article, we’ll look at how to enumerate dates between two dates in Moment and JavaScript.

How to enumerate dates between two dates in Moment and JavaScript?

To enumerate dates between two dates in Moment and JavaScript, we use a while loop.

For instance, we write

const enumerateDaysBetweenDates = (startDate, endDate) => {
  const now = startDate.clone();
  const dates = [];

  while (now.isSameOrBefore(endDate)) {
    dates.push(now.format("M/D/YYYY"));
    now.add(1, "days");
  }
  return dates;
};

to define the enumerateDaysBetweenDates function.

In it, we clone startDate with clone.

And then we call now.isSameOrBefore with endDate to check if now is before or same as endDate.

If it is, the while loop runs.

In it, we call dates.push to push the now date formatted into a string into dates.

Then we call now.add to add day tonow`.

Finally, we return the dates array.

Conclusion

To enumerate dates between two dates in Moment and JavaScript, we use a while loop.

Sometimes, we want to convert JavaScript array to CSV.

In this article, we’ll look at how to convert JavaScript array to CSV.

How to convert JavaScript array to CSV?

To convert JavaScript array to CSV, we use array and object methods.

For instance, we write

const data = [
  { title: "Book title 1", author: "Name1 Surname1" },
  { title: "Book title 2", author: "Name2 Surname2" },
  { title: "Book title 3", author: "Name3 Surname3" },
  { title: "Book title 4", author: "Name4 Surname4" },
];

const csv = data
  .map((d) => {
    return Object.values(d).join(",");
  })
  .join("\n")

to call data.map with a callback that gets the values from each object in data with Object.values.

Then we call join to join the values into a string with each entry separated by a comma.

Then we call join again to combine the strings into a CSV with each line separated by a new line character.

Conclusion

To convert JavaScript array to CSV, we use array and object methods.

Sometimes, we want to convert 12 hour (AM/PM) string to 24 hour string using moment.js and JavaScript.

In this article, we’ll look at how to convert 12 hour (AM/PM) string to 24 hour string using moment.js and JavaScript.

How to convert 12 hour (AM/PM) string to 24 hour string using moment.js and JavaScript?

To convert 12 hour (AM/PM) string to 24 hour string using moment.js and JavaScript, we use the format method.

For instance, we write

const dt = moment("12:15 AM", ["h:mm A"]).format("HH:mm");

to create a moment object from the time string with moment.

Then we format it into a 24 hour time string by calling format with 'HH:mm'.

Conclusion

To convert 12 hour (AM/PM) string to 24 hour string using moment.js and JavaScript, we use the format method.