nofx/web/node_modules/d3-time/src/month.js

import {timeInterval} from "./interval.js";

export const timeMonth = timeInterval((date) => {
  date.setDate(1);
  date.setHours(0, 0, 0, 0);
}, (date, step) => {
  date.setMonth(date.getMonth() + step);
}, (start, end) => {
  return end.getMonth() - start.getMonth() + (end.getFullYear() - start.getFullYear()) * 12;
}, (date) => {
  return date.getMonth();
});

export const timeMonths = timeMonth.range;

export const utcMonth = timeInterval((date) => {
  date.setUTCDate(1);
  date.setUTCHours(0, 0, 0, 0);
}, (date, step) => {
  date.setUTCMonth(date.getUTCMonth() + step);
}, (start, end) => {
  return end.getUTCMonth() - start.getUTCMonth() + (end.getUTCFullYear() - start.getUTCFullYear()) * 12;
}, (date) => {
  return date.getUTCMonth();
});

export const utcMonths = utcMonth.range;