如何在特定日期下载文件？[ Kotlin Android开发]

import java.io.BufferedInputStream
import java.io.File
import java.io.FileOutputStream
import java.net.URL
import java.util.Calendar

fun downloadFileOnSpecificDate(urlString: String, filePath: String, year: Int, month: Int, day: Int) {
    val calendar = Calendar.getInstance()
    calendar.set(year, month - 1, day) // 注意月份是从0开始的

    // 检查日期是否已经过去，如果是则不执行下载
    if (calendar.timeInMillis < System.currentTimeMillis()) {
        println("指定的日期已经过去，无法下载文件。")
        return
    }

    try {
        val url = URL(urlString)
        val connection = url.openConnection()
        val inputStream = BufferedInputStream(url.openStream())
        val outputFile = File(filePath)

        val outputStream = FileOutputStream(outputFile)
        val dataBuffer = ByteArray(1024)
        var bytesRead: Int
        while (inputStream.read(dataBuffer).also { bytesRead = it } > 0) {
            outputStream.write(dataBuffer, 0, bytesRead)
        }

        outputStream.flush()
        outputStream.close()
        inputStream.close()

        println("文件已成功下载到：$filePath")
    } catch (e: Exception) {
        println("下载文件时发生错误：${e.message}")
    }
}

// 使用示例
val fileUrl = "https://example.com/path/to/file.zip"
val destinationPath = "/path/to/save/file.zip"
downloadFileOnSpecificDate(fileUrl, destinationPath, 2023, 10, 30)