interval.round(date) Returns a new date representing the closest interval boundary date to date. For example

d3.timeMillisecond d3.utcMillisecond Milliseconds; the shortest available time unit.

d3.timeWednesday d3.utcWednesday Wednesday-based weeks (e.g., February 8, 2012 at 12:00 AM).

interval.count(start, end) Returns the number of interval boundaries after start (exclusive) and before

interval.every(step) Returns a filtered

d3.timeMilliseconds(start, stop[, step]) d3.utcMilliseconds(start, stop[, step]) Aliases

d3.timeSunday d3.utcSunday Sunday-based weeks (e.g., February 5, 2012 at 12:00 AM).

d3.timeWeeks(start, stop[, step]) d3.utcWeeks(start, stop[, step]) Aliases for

d3.timeMonth d3.utcMonth Months (e.g., February 1, 2012 at 12:00 AM); ranges from 28 to 31 days.

d3.timeWeek d3.utcWeek Alias for sunday; 7 days and typically