date-fns#lastDayOfMonth TypeScript Examples

The following examples show how to use date-fns#lastDayOfMonth. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.

Example #1

Source File: dateUtils.tsx From symphony-ui-toolkit with Apache License 2.0

6 votes

export function getDaysNeededForNextMonth(date: Date, locale: Locale) {
  const daysNeededForLastMonth = getDaysNeededForLastMonth(date, locale);
  const lastDayOfWeek = endOfWeek(date, { locale });

  const endDate = lastDayOfMonth(date);

  // getDay return the value of the weekday from 0 to 6
  // i.e enDate is the Friday -> getDay(enDate) = 5
  // i.e. lastDayOfWeek is a Saturday -> getDay(lastDayOfWeek) = 6 (depends on locale)
  // + 7 and the modulo to ensure the result is positive value is between 0 and 6 (javascript % can return negative value)
  let daysNeededForNextMonth =
    (getDay(lastDayOfWeek) - getDay(endDate) + 7) % 7;
  if (daysNeededForLastMonth + getDaysInMonth(date) <= 35) {
    daysNeededForNextMonth += 7;
  }
  return daysNeededForNextMonth;
}

Example #2

Source File: DayPicker.tsx From symphony-ui-toolkit with Apache License 2.0

5 votes

handleKeyDownCell(e: React.KeyboardEvent, date: Date, modifers): void {
    const { locale, dir } = this.props;
    const { currentMonth } = this.state;
    if (e.key !== Keys.ESC) {
      cancelEvent(e);
    }

    const direction = dir === 'ltr' ? 1 : -1;
    const MAX_STEP_TO_CHECK = 7;
    let nextCell;
    switch (e.key) {
    case Keys.TAB:
      if (this.dayPicker) {
        if (e.shiftKey) {
          this.dayPicker
            .querySelector('.tk-daypicker-header--nextYear')
            .focus();
        } else {
          this.dayPicker.querySelector('.tk-daypicker-today').focus();
        }
      }
      break;
    case Keys.SPACE:
    case Keys.SPACEBAR:
    case Keys.ENTER:
      // eslint-disable-next-line no-case-declarations
      const { onDayClick } = this.props;
      onDayClick(date, modifers);
      break;
    case Keys.PAGE_UP:
      if (e.shiftKey) {
        this.monthNavigation(date, addYears(currentMonth, -1));
      } else {
        this.monthNavigation(date, addMonths(currentMonth, -1));
      }
      break;
    case Keys.PAGE_DOWN:
      if (e.shiftKey) {
        this.monthNavigation(date, addYears(currentMonth, 1));
      } else {
        this.monthNavigation(date, addMonths(currentMonth, 1));
      }
      break;
    case Keys.HOME:
      // eslint-disable-next-line no-case-declarations
      const firstDayOfWeek = startOfWeek(date, { locale });
      nextCell =
          firstDayOfWeek.getDate() <= date.getDate()
            ? firstDayOfWeek
            : startOfMonth(date);
      this.focusOnlyEnabledCell(nextCell, 'next', MAX_STEP_TO_CHECK);
      break;
    case Keys.END:
      // eslint-disable-next-line no-case-declarations
      const lastDayOfWeek = endOfWeek(date, { locale });
      nextCell =
          date.getDate() <= lastDayOfWeek.getDate()
            ? lastDayOfWeek
            : lastDayOfMonth(date);
      this.focusOnlyEnabledCell(nextCell, 'previous', MAX_STEP_TO_CHECK);
      break;
    case Keys.ARROW_LEFT:
      this.arrowNavigation(date, addDays(date, -1 * direction));
      break;
    case Keys.ARROW_UP:
      this.arrowNavigation(date, addDays(date, -7));
      break;
    case Keys.ARROW_RIGHT:
      this.arrowNavigation(date, addDays(date, 1 * direction));
      break;
    case Keys.ARROW_DOWN:
      this.arrowNavigation(date, addDays(date, 7));
      break;
    default:
      break;
    }
  }