toISOString

The `toISOString` method is a built-in JavaScript function that returns a string representing the date in the ISO 8601 format. This format is a standardized way to represent dates and times, ensuring consistency across different systems and applications. The method is called on a Date object and does not take any arguments.

The output string follows the pattern YYYY-MM-DDTHH:mm:ss.sssZ. YYYY represents the four-digit year, MM is the two-digit month (01 for January, 12 for December), and DD is the two-digit day of the month. T is a literal character separating the date and time components. HH is the two-digit hour in 24-hour format, mm is the two-digit minute, and ss is the two-digit second. sss represents milliseconds, and Z indicates that the time is in Coordinated Universal Time (UTC).

For example, if you have a JavaScript Date object representing December 25, 2023, at 10:30:00 AM UTC, calling `toISOString()` on it would produce the string "2023-12-25T10:30:00.000Z". If the Date object represents a time in a different timezone, `toISOString` will still convert it to UTC before generating the string. This makes it highly useful for logging, data storage, and inter-application communication where a unambiguous representation of a specific point in time is required.