vant-weapp/example/pages/datetime-picker/index.js

import Page from '../../common/page';
import Toast from '../../dist/toast/toast';

Page({
  data: {
    minHour: 10,
    maxHour: 20,
    minDate: new Date(2018, 0, 1).getTime(),
    maxDate: new Date(2019, 10, 1).getTime(),
    currentDate1: new Date(2018, 2, 31).getTime(),
    currentDate2: null,
    currentDate3: new Date(2018, 0, 1),
    currentDate4: '12:00',
    loading: false
  },

  onInput(event) {
    const { detail, currentTarget } = event;
    const result = this.getResult(detail, currentTarget.dataset.type);

    Toast(result);
  },

  getResult(time, type) {
    const date = new Date(time);
    switch (type) {
      case 'datetime':
        return date.toLocaleString();
      case 'date':
        return date.toLocaleDateString();
      case 'year-month':
        return `${date.getFullYear()}/${date.getMonth() + 1}`;
      case 'time':
        return time;
      default:
        return '';
    }
  }
});