Question

四舍五入到最接近的15分钟间隔。我想知道是否有办法让我向上或向下舍入到最近的15分钟间隔。我使用此函数，但是在H和H = 15分钟之间，我没有参数。

private lateinit var fileDir: File
private lateinit var items: MutableList<String>
private lateinit var itemsAdapter: ArrayAdapter<String>
private lateinit var listVIL: ListView

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_todo1)
    listVIL = findViewById(R.id.listVI)

    try {
        fileDir = File(Environment.getExternalStorageDirectory(), "todo.txt")
        if (!fileDir.exists()) fileDir.createNewFile()
        items = ArrayList(file.readLines())
        itemsAdapter = ArrayAdapter(this, android.R.layout.simple_list_item_1, items)
        listVIL.adapter = itemsAdapter
    } catch (e: Exception) {
        Toast.makeText(applicationContext,e.toString(),Toast.LENGTH_LONG).show()
    }
}

Answer 1

舍入：

var d = new Date('2001-02-03T04:59:59.999Z'), rounded = new Date( d - d % 9e5 );

console.log( d ); console.log( rounded );        /* 1000 ms * 60 sec * 15 min = 900000 */

console.log( rounded.toJSON().replace(/.*-(..)-(..)T(..):(..).*/, 'image/type$1$2$3$4.png') );

舍入到最接近的15分钟：

var d = new Date('2001-02-03T04:52:30.000Z'), 
    rounded = new Date( Math.round(d / 9e5) * 9e5 );

console.log( d ); console.log( rounded );

四舍五入到最后15分钟

1 个答案: