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社区首页 >问答首页 >转到最近的n小时

问转到最近的n小时
EN

Stack Overflow用户
提问于 2013-09-12 01:41:42
回答 3查看 3.2K关注 0票数 2

我试着把约会时间缩短到最近的3、6、12或24小时(从午夜开始)。给定以下输入，我正在寻找相关的输出。

代码语言：javascript
复制
for 24 hours
2013-09-11 00:00:00 -> 2013-09-11 00:00:00 (no change needed)
2013-09-11 01:30:25 -> 2013-09-11 00:00:00 (rounded down)
2013-09-11 12:01:01 -> 2013-09-12 00:00:00 (rounded up)

for 12 hours
2013-09-11 00:00:00 -> 2013-09-11 00:00:00 (no change needed)
2013-09-11 12:00:00 -> 2013-09-11 12:00:00 (no change needed)
2013-09-11 11:50:57 -> 2013-09-11 12:00:00 (rounded up)
2013-09-11 12:01:00 -> 2013-09-11 12:00:00 (rounded down)
2013-09-11 22:15:48 -> 2013-09-12 00:00:00 (rounded up)

for 6 hours
2013-09-11 05:50:57 -> 2013-09-11 06:00:00 (rounded up)
2013-09-11 08:50:57 -> 2013-09-11 06:00:00 (rounded down)
2013-09-11 10:50:57 -> 2013-09-11 12:00:00 (rounded up)

for 3 hours
2013-09-11 01:50:57 -> 2013-09-11 00:00:00 (rounded down)
2013-09-11 02:50:57 -> 2013-09-11 03:00:00 (rounded up)
2013-09-11 09:40:57 -> 2013-09-11 09:00:00 (rounded down)

etc...

我一直在寻找所有这些有趣的解决方案，使其四舍五入到最近的一分钟，但我似乎无法满足自己的需要。我以为我使用了下面的引用#2，但是它失败了(http://jsfiddle.net/LUwk8/2/)。有什么想法吗？

参考文献：

  1. Round Date to nearest 15 minute interval in Flex
  2. How to round time to the nearest quarter hour in JavaScript?
javascript
EN

回答 3

Stack Overflow用户

回答已采纳

发布于 2013-09-12 01:49:47

使用[get|set][Hours|Minutes|Seconds|Milliseconds]()获取小数小时，并将其舍入到间隔：

代码语言：javascript
复制
function roundTo(num, interval) {
    return Math.round(num / interval) * interval;
}

function roundHours(date, interval) {
    var newDate = new Date(date);
    var h = newDate.getHours() + newDate.getMinutes() / 60 + newDate.getSeconds() / 3600 + newDate.getMilliseconds() / 3600000;
    newDate.setMinutes(0);
    newDate.setSeconds(0);
    newDate.setMilliseconds(0);
    newDate.setHours(roundTo(h, interval));

    return newDate;
}
票数 3
EN

Stack Overflow用户

发布于 2013-09-12 02:48:56

你可以用时间除以精度的方式，

如果你想让凌晨一点一直到午夜，

而不是3，6或中午。

代码语言：javascript
复制
function roundHours(precision, d){
    precision= precision || 1;
    d= d? new Date(d):new Date();
    if(d.getSeconds()>30) d.setMinutes(d.getMinutes()+1);
    if(d.getMinutes>30) hours+= 1;
    var hours= d.getHours(), diff= hours%precision;
    if(diff>precision/2) hours+= (precision-diff);
    else hours-= diff;
    d.setHours(hours, 0, 0, 0);
    return d.toLocaleString();
}

//测试精度：

代码语言：javascript
复制
var A= [], range=[3,6,12,24], d1= new Date();
for(var x= 0; x<4; x++){
    A.push('\n'+range[x]+ ' hour precision:');
    for(var i= 0; i<24; i++){
        d1.setHours(i);
        A.push(i+':  '+roundHours(range[x], d1));
    }
}
A.join('\n');

//返回值：(字符串)

代码语言：javascript
复制
3 hour precision:
00:  Wednesday, September 11, 2013 12:00:00 AM
01:  Wednesday, September 11, 2013 12:00:00 AM
02:  Wednesday, September 11, 2013 3:00:00 AM
03:  Wednesday, September 11, 2013 3:00:00 AM
04:  Wednesday, September 11, 2013 3:00:00 AM
05:  Wednesday, September 11, 2013 6:00:00 AM
06:  Wednesday, September 11, 2013 6:00:00 AM
07:  Wednesday, September 11, 2013 6:00:00 AM
08:  Wednesday, September 11, 2013 9:00:00 AM
09:  Wednesday, September 11, 2013 9:00:00 AM
10:  Wednesday, September 11, 2013 9:00:00 AM
11:  Wednesday, September 11, 2013 12:00:00 PM
12:  Wednesday, September 11, 2013 12:00:00 PM
13:  Wednesday, September 11, 2013 12:00:00 PM
14:  Wednesday, September 11, 2013 3:00:00 PM
15:  Wednesday, September 11, 2013 3:00:00 PM
16:  Wednesday, September 11, 2013 3:00:00 PM
17:  Wednesday, September 11, 2013 6:00:00 PM
18:  Wednesday, September 11, 2013 6:00:00 PM
19:  Wednesday, September 11, 2013 6:00:00 PM
20:  Wednesday, September 11, 2013 9:00:00 PM
21:  Wednesday, September 11, 2013 9:00:00 PM
22:  Wednesday, September 11, 2013 9:00:00 PM
23:  Thursday, September 12, 2013 12:00:00 AM

6 hour precision:
00:  Wednesday, September 11, 2013 12:00:00 AM
01:  Wednesday, September 11, 2013 12:00:00 AM
02:  Wednesday, September 11, 2013 12:00:00 AM
03:  Wednesday, September 11, 2013 12:00:00 AM
04:  Wednesday, September 11, 2013 6:00:00 AM
05:  Wednesday, September 11, 2013 6:00:00 AM
06:  Wednesday, September 11, 2013 6:00:00 AM
07:  Wednesday, September 11, 2013 6:00:00 AM
08:  Wednesday, September 11, 2013 6:00:00 AM
09:  Wednesday, September 11, 2013 6:00:00 AM
10:  Wednesday, September 11, 2013 12:00:00 PM
11:  Wednesday, September 11, 2013 12:00:00 PM
12:  Wednesday, September 11, 2013 12:00:00 PM
13:  Wednesday, September 11, 2013 12:00:00 PM
14:  Wednesday, September 11, 2013 12:00:00 PM
15:  Wednesday, September 11, 2013 12:00:00 PM
16:  Wednesday, September 11, 2013 6:00:00 PM
17:  Wednesday, September 11, 2013 6:00:00 PM
18:  Wednesday, September 11, 2013 6:00:00 PM
19:  Wednesday, September 11, 2013 6:00:00 PM
20:  Wednesday, September 11, 2013 6:00:00 PM
21:  Wednesday, September 11, 2013 6:00:00 PM
22:  Thursday, September 12, 2013 12:00:00 AM
23:  Thursday, September 12, 2013 12:00:00 AM

12 hour precision:
00:  Wednesday, September 11, 2013 12:00:00 AM
01:  Wednesday, September 11, 2013 12:00:00 AM
02:  Wednesday, September 11, 2013 12:00:00 AM
03:  Wednesday, September 11, 2013 12:00:00 AM
04:  Wednesday, September 11, 2013 12:00:00 AM
05:  Wednesday, September 11, 2013 12:00:00 AM
06:  Wednesday, September 11, 2013 12:00:00 AM
07:  Wednesday, September 11, 2013 12:00:00 PM
08:  Wednesday, September 11, 2013 12:00:00 PM
09:  Wednesday, September 11, 2013 12:00:00 PM
10:  Wednesday, September 11, 2013 12:00:00 PM
11:  Wednesday, September 11, 2013 12:00:00 PM
12:  Wednesday, September 11, 2013 12:00:00 PM
13:  Wednesday, September 11, 2013 12:00:00 PM
14:  Wednesday, September 11, 2013 12:00:00 PM
15:  Wednesday, September 11, 2013 12:00:00 PM
16:  Wednesday, September 11, 2013 12:00:00 PM
17:  Wednesday, September 11, 2013 12:00:00 PM
18:  Wednesday, September 11, 2013 12:00:00 PM
19:  Thursday, September 12, 2013 12:00:00 AM
20:  Thursday, September 12, 2013 12:00:00 AM
21:  Thursday, September 12, 2013 12:00:00 AM
22:  Thursday, September 12, 2013 12:00:00 AM
23:  Thursday, September 12, 2013 12:00:00 AM

24 hour precision:
00:  Wednesday, September 11, 2013 12:00:00 AM
01:  Wednesday, September 11, 2013 12:00:00 AM
02:  Wednesday, September 11, 2013 12:00:00 AM
03:  Wednesday, September 11, 2013 12:00:00 AM
04:  Wednesday, September 11, 2013 12:00:00 AM
05:  Wednesday, September 11, 2013 12:00:00 AM
06:  Wednesday, September 11, 2013 12:00:00 AM
07:  Wednesday, September 11, 2013 12:00:00 AM
08:  Wednesday, September 11, 2013 12:00:00 AM
09:  Wednesday, September 11, 2013 12:00:00 AM
10:  Wednesday, September 11, 2013 12:00:00 AM
11:  Wednesday, September 11, 2013 12:00:00 AM
12:  Wednesday, September 11, 2013 12:00:00 AM
13:  Thursday, September 12, 2013 12:00:00 AM
14:  Thursday, September 12, 2013 12:00:00 AM
15:  Thursday, September 12, 2013 12:00:00 AM
16:  Thursday, September 12, 2013 12:00:00 AM
17:  Thursday, September 12, 2013 12:00:00 AM
18:  Thursday, September 12, 2013 12:00:00 AM
19:  Thursday, September 12, 2013 12:00:00 AM
20:  Thursday, September 12, 2013 12:00:00 AM
21:  Thursday, September 12, 2013 12:00:00 AM
22:  Thursday, September 12, 2013 12:00:00 AM
23:  Thursday, September 12, 2013 12:00:00 AM
票数 3
EN

Stack Overflow用户

发布于 2013-09-12 03:30:31

这里有一个使用时间值的替代方法。因为它是UTC，所以对偏移量进行了调整，使UTC看起来像本地的、四舍五入的，然后将偏移量加回以获得本地时间。

代码语言：javascript
复制
// d is a date object
function roundTo3Hrs(d) {

  // Three hours in milliseconds
  var g = 3 * 60 * 60 * 1000;

  // Get local offset
  var o = d.getTimezoneOffset() * -6e4;

  // Round to nearest 3 hrs
  var x = Math.round((+d + o)/g);

  // Return a new date object
  return new Date(x * g - o);
}

// Some (minimal) tests
var now = new Date();
now.setHours(13,29,59,999);
alert(roundTo3Hrs(now)); // 12:00

now.setHours(13,30,0,0);
alert(roundTo3Hrs(now)); // 15:00

这对我来说很有吸引力，因为它看上去很有效率，并且可以适应到任何范围(1小时、3小时、6小时等)。

票数 1
EN
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：

https://stackoverflow.com/questions/18754002

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