delivery-business/pages/bill/bill.js

// pages/bill/bill.js
Page({
  data: {
    date: '',
    show: false,
  },

  onDisplay() {
    this.setData({ show: true });
  },
  onClose() {
    this.setData({ show: false });
  },
  formatDate(date) {
    date = new Date(date);
    return `${date.getMonth() + 1}/${date.getDate()}`;
  },
  onConfirm(event) {
    const [start, end] = event.detail;
    this.setData({
      show: false,
      date: `${this.formatDate(start)} - ${this.formatDate(end)}`,
    });
  },
});