silphius/app/ecs/components/time.js

import Component from '@/ecs/component.js';
import {IRL_MINUTES_PER_GAME_DAY} from '@/util/constants';

const realSecondsPerGameDay = 60 * IRL_MINUTES_PER_GAME_DAY;
const realSecondsPerGameHour = realSecondsPerGameDay / 24;
const realSecondsPerGameMinute = realSecondsPerGameHour / 60;

export default class Time extends Component {
  instanceFromSchema() {
    return class TimeInstance extends super.instanceFromSchema() {
      static gameDayLengthInRealSeconds = 24 * realSecondsPerGameHour;
      get hour() {
        return this.$$irlSeconds / realSecondsPerGameHour;
      }
      get minute() {
        return (this.$$irlSeconds % realSecondsPerGameHour) / realSecondsPerGameMinute;
      }
    };
  }
  static properties = {
    irlSeconds: {defaultValue: 10 * realSecondsPerGameHour, type: 'uint16'},
  };
}