This code provides a function ISODateString that converts a Date object into a standardized ISO 8601 formatted string, ensuring consistent date and time representation. It utilizes helper functions and UTC methods to achieve this conversion.

Run example

npm run import -- "Convert a date to ISO"

Convert a date to ISO

function ISODateString(d) {
    function pad(n) {
        return n < 10 ? '0' + n : n
    }

    return d.getUTCFullYear() + '-'
        + pad(d.getUTCMonth() + 1) + '-'
        + pad(d.getUTCDate()) + 'T'
        + pad(d.getUTCHours()) + ':'
        + pad(d.getUTCMinutes()) + ':'
        + pad(d.getUTCSeconds()) + '-00:00';
};
module.exports = ISODateString;

/**
 * Converts a Date object to an ISO 8601 formatted string.
 *
 * @param {Date} date - The date to be converted.
 * @returns {string} The ISO 8601 formatted string.
 */
function isoDateString(date) {
    // Use a reusable function to pad the date components
    const pad = n => (n < 10? '0' + n : n);

    // Use template literals for better readability
    return `${date.getUTCFullYear()}-${pad(date.getUTCMonth() + 1)}-${pad(date.getUTCDate())}T`
        + `${pad(date.getUTCHours())}:${pad(date.getUTCMinutes())}:${pad(date.getUTCSeconds())}-00:00`;
}

// Export the function as a module
module.exports = isoDateString;

This code defines a function ISODateString that converts a Date object into an ISO 8601 formatted string.

Here's a breakdown:

1. pad(n) function:

   • This helper function takes a number n and adds a leading zero if it's less than 10. This ensures consistent two-digit formatting for hours, minutes, seconds, etc.

2. ISODateString(d) function:

   • Takes a Date object d as input.
   • Uses getUTCFullYear(), getUTCMonth(), getUTCDate(), getUTCHours(), getUTCMinutes(), and getUTCSeconds() to extract the year, month, date, hours, minutes, and seconds from the date object.
   • Calls the pad() function to format each component with leading zeros if necessary.
   • Concatenates the formatted components into a string in the ISO 8601 format: YYYY-MM-DDTHH:mm:ss-00:00.

3. Export:

   • The module.exports = ISODateString; line makes the ISODateString function available for use in other parts of the project or in other modules.

Let me know if you have any other code snippets you'd like me to explain!