ivue-material-plus/src/utils/month-change.ts

A high quality UI components Library with Vue.js

import Pad from './pad';

/**
 * @param {String} value YYYY-MM format
 * @param {Number} sign -1 or +1
 */
export default (value: string, sign: number) => {
  const [year, month] = String(value)
    .split('-')
    .map((v: any) => 1 * v);

  // 月尾
  if (month + sign === 0) {
    return `${year - 1}-12`;
  }
  // 下一年
  else if (month + sign === 13) {
    return `${year + 1}-01`;
  }
  // 年份
  else {
    return `${year}-${Pad(month + sign)}`;
  }
};