@onesy/date/esm/add.js

Time and date utils library

import { clamp } from '@onesy/utils';
import OnesyDate from './OnesyDate';
import endOf from './endOf';
export default function add(value, unit) {
  let onesyDate_ = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : OnesyDate.onesyDate;

  if (onesyDate_ && onesyDate_.valid) {
    const onesyDate = new OnesyDate(onesyDate_);

    switch (unit) {
      case 'millisecond':
        return new OnesyDate(onesyDate.value.setMilliseconds(onesyDate.millisecond + value));

      case 'second':
        return new OnesyDate(onesyDate.value.setSeconds(onesyDate.second + value));

      case 'minute':
        return new OnesyDate(onesyDate.value.setMinutes(onesyDate.minute + value));

      case 'hour':
        return new OnesyDate(onesyDate.value.setHours(onesyDate.hour + value));

      case 'day':
        return new OnesyDate(onesyDate.value.setDate(onesyDate.day + value));

      case 'week':
        return new OnesyDate(onesyDate.value.setDate(onesyDate.day + value * 7));

      case 'month':
        // Get middle of month to move to
        // and its endOf month,
        // move to that months actual day or last day
        let day = onesyDate.day;
        let month = new OnesyDate(onesyDate.value.setDate(15));
        month = new OnesyDate(onesyDate.value.setMonth(onesyDate.month - 1 + value));
        const monthEnd = endOf(month, 'month');
        day = clamp(day, 0, monthEnd.day);
        month.value.setDate(day);
        month = new OnesyDate(month.value);
        return month;

      case 'year':
        return new OnesyDate(onesyDate.value.setFullYear(onesyDate.year + value));

      default:
        break;
    }
  }
}