(function(global, factory) {
  typeof exports === "object" && typeof module !== "undefined" ? factory(exports, require("chart.js"), require("spacetime")) : typeof define === "function" && define.amd ? define(["exports", "chart.js", "spacetime"], factory) : (global = typeof globalThis !== "undefined" ? globalThis : global || self, factory(global["chartjs-adapter-spacetime"] = {}, global.Chart, global.spacetime));
})(this, function(exports2, chart_js, Spacetime) {
  "use strict";
  const FORMATS = {
    default: "M/d/yyyy",
    datetime: "MMM d, yyyy, h:mm:ss a",
    millisecond: "h:mm:ss.SSS a",
    second: "h:mm:ss a",
    minute: "h:mm a",
    hour: "h a",
    day: "MMM d",
    week: "MMM d, yyyy",
    month: "MMM yyyy",
    quarter: "'Q'Q '-' yyyy",
    year: "yyyy"
  };
  const isKnownFormat = (format) => format in FORMATS;
  const spacetime = (value, weekStart) => Spacetime(value, "UTC", {
    weekStart
  });
  const adapter = {
    formats: function() {
      return FORMATS;
    },
    init: function() {
    },
    parse: function(value) {
      const s = spacetime(value);
      return s.isValid() ? spacetime(s).toNativeDate().getTime() : null;
    },
    format: function(time, format) {
      const s = spacetime(time);
      if (isKnownFormat(format)) {
        return s.unixFmt(FORMATS[format]);
      } else {
        return s.unixFmt(format);
      }
    },
    add: function(time, amount, unit) {
      return spacetime(time).add(amount, unit).toNativeDate().getTime();
    },
    diff: function(max, min, unit) {
      return spacetime(min).diff(spacetime(max))[`${unit}s`];
    },
    startOf: function(time, unit, weekStart) {
      if (unit === "isoWeek") {
        const dateTime = spacetime(
          time,
          Math.trunc(Math.min(Math.max(0, Number(weekStart)), 6)) || 0
        );
        return dateTime.startOf("week").toNativeDate().getTime();
      } else {
        return spacetime(time).startOf(unit).toNativeDate().getTime();
      }
    },
    endOf: function(time, unit) {
      return spacetime(time).endOf(unit).toNativeDate().getTime();
    }
  };
  chart_js._adapters._date.override(adapter);
  exports2.FORMATS = FORMATS;
  exports2.adapter = adapter;
  Object.defineProperty(exports2, Symbol.toStringTag, { value: "Module" });
});