@kalender/core/src/date-tools/date.ts

calendar core library

import { WeekDay } from './definition';
import { daysOfMonth } from './month';

export function isWorkDay(date: Date) {
  const day = date.getDay();
  return day >= 1 && day <= 5;
}

export function isWeekend(date: Date) {
  const day = date.getDay();
  return day === 6 || day === 0;
}

export function getWeekDay(date: Date) {
  const day = date.getDay();
  return day === 0 ? 7 : (day as WeekDay);
}

export function getMonth(date: Date) {
  return date.getMonth() + 1;
}

export function eraseTime(date: Date) {
  const { year, month, day } = extract(date);
  return normalDate(year, month, day);
}

export function extract(date: Date) {
  return {
    year: date.getFullYear(),
    month: getMonth(date),
    day: date.getDate(),
    weekDay: getWeekDay(date),
    dayOfYear: dayOfYear(date),
    hour: date.getHours(),
    minute: date.getMinutes(),
    second: date.getSeconds(),
  };
}

export function extractDate(date: Date) {
  return {
    year: date.getFullYear(),
    month: getMonth(date),
    day: date.getDate(),
    weekDay: getWeekDay(date),
  };
}

export function normalDate(year: number, month: number, day: number = 1) {
  return new Date(year, month - 1, day);
}

export function perfectDate(year: number, month: number, day: number = 1) {
  if (day > 0) {
    return normalDate(year, month, day);
  }
  const maxDay = daysOfMonth(year, month);
  if (day === 0) day = -1;
  return normalDate(year, month, day + maxDay + 1);
}

export function dayOfYear(date: Date) {
  const firstDay = normalDate(date.getFullYear(), 1, 1);

  return (date.valueOf() - firstDay.valueOf()) / 1000 / 3600 / 24 + 1;
}

export function addWeekDays(day: WeekDay, count: number) {
  count = count % 7;
  day = day + count;
  if (day < 0) {
    day += 7;
  }
  if (day > 7) {
    day -= 7;
  }
  return day;
}

export function now() {
  return new Date();
}

export function daysRemainOfMonth(date: Date) {
  const { year, month, day } = extract(date);
  const days = daysOfMonth(year, month);
  return days - day;
}