The epochMilliseconds accessor property of Temporal.Instant instances returns an integer representing the number of milliseconds elapsed since the Unix epoch (midnight at the beginning of January 1, 1970, UTC) to this instant. It is equivalent to dividing epochNanoseconds by 1e6 and flooring the result.

The Math.LOG10E static data property represents the base 10 logarithm of e, approximately 0.434.

The Math.LN2 static data property represents the natural logarithm of 2, approximately 0.693:

The toDateString() method of Date instances returns a string representing the date portion of this date interpreted in the local timezone.

The Temporal.PlainYearMonth object represents the year and month of a calendar date, without a day or time zone; for example, an event on a calendar that happens during the whole month. It is fundamentally represented as an ISO 8601 calendar date, with year, month, and day fields, and an associated calendar system. The day is used to disambiguate the year-month in non-ISO calendar systems.

The getWeekInfo() method of Intl.Locale instances returns a weekInfo object with the properties firstDay, weekend and minimalDays for this locale.

The Temporal.ZonedDateTime object represents a date and time with a time zone. It is fundamentally represented as a combination of an instant, a time zone, and a calendar system.

The Intl.DateTimeFormat() constructor creates Intl.DateTimeFormat objects.

The toLocaleString() method of Number values returns a string with a language-sensitive representation of this number. In implementations with Intl.NumberFormat API support, this method delegates to Intl.NumberFormat.

The hourCycle accessor property of Intl.Locale instances returns the hour cycle type for this locale.