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To add time selection and calendar date selection in a WeChat mini program, you need to make changes in the js, wxml, wxss, and json files. Here's how you can do it:

1. In the wxml file (e.g., index.wxml), add a button or input field to trigger the time selection or calendar date selection:

<!-- Time selection -->
<button bindtap="showTimePicker">Select Time</button>

<!-- Calendar date selection -->
<button bindtap="showDatePicker">Select Date</button>

2. In the js file (e.g., index.js), define the functions showTimePicker and showDatePicker to show the time picker or date picker respectively:

Page({
  showTimePicker: function () {
    wx.showTimePicker({
      success: function (res) {
        // Handle the selected time
        console.log(res)
      }
    })
  },

  showDatePicker: function () {
    wx.showDatePicker({
      success: function (res) {
        // Handle the selected date
        console.log(res)
      }
    })
  },

  // Other code...
})

3. In the wxss file (e.g., index.wxss), you can add custom styles for the time picker or date picker if needed.

4. In the json file (e.g., index.json), make sure to enable the required permissions for using the time picker and date picker:

{
  "usingComponents": {},
  "permission": {
    "scope.userLocation": {
      "desc": "Your location will be used to provide accurate weather information."
    },
    "scope.record": {
      "desc": "Your voice will be used to record audio messages."
    },
    "scope.writePhotosAlbum": {
      "desc": "Your photos will be saved to the album."
    },
    "scope.camera": {
      "desc": "Your camera will be used to take photos."
    },
    "scope.userInfo": {
      "desc": "Your profile information will be used to personalize your experience."
    },
    "scope.userLocationBackground": {
      "desc": "Your location will be used to provide accurate weather information in the background."
    }
  }
}

Make sure to replace "index" with the actual file name where you want to add the time selection and calendar date selection.

Remember to customize the code according to your requirements and add appropriate event handlers to handle the selected time or date