如何使用 JavaScript 日期对象四舍五入到最近的小时
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How to round to nearest hour using JavaScript Date Object
提问by dSquared
I am working on a project that requires a time in the future to be set using the Date object.
我正在处理一个需要使用 Date 对象设置未来时间的项目。
For example:
例如：
futureTime = new Date();
futureTime.setHours(futureTime.getHours()+2);
My questions is; once the future date is set, how can I round to the closest full hour and then set the futureTime var with it?
我的问题是；一旦设置了未来日期，我如何四舍五入到最接近的完整小时，然后用它设置 futureTime 变量？
For example:
例如：
Given 8:55 => var futureTime = 9:00
Given 16:23 => var futureTime = 16:00
Any help would be appreciated!
任何帮助，将不胜感激！
回答by Joe
Round the minutes and then clear the minutes:
四舍五入分钟，然后清除分钟：
var date = new Date(2011,1,1,4,55); // 4:55
roundMinutes(date); // 5:00
function roundMinutes(date) {
date.setHours(date.getHours() + Math.round(date.getMinutes()/60));
date.setMinutes(0, 0, 0); // Resets also seconds and milliseconds
return date;
}
回答by Felix Livni
The other answers ignore seconds and milliseconds components of the date. I would do something like this:
其他答案忽略日期的秒和毫秒部分。我会做这样的事情：
function roundToHour(date) {
p = 60 * 60 * 1000; // milliseconds in an hour
return new Date(Math.round(date.getTime() / p ) * p);
}
var date = new Date(2011,1,1,4,55); // 4:55
roundToHour(date); // 5:00
date = new Date(2011,1,1,4,25); // 4:25
roundToHour(date); // 4:00
回答by HBP
A slightly simpler way :
一个稍微简单的方法：
var d = new Date();
d.setMinutes (d.getMinutes() + 30);
d.setMinutes (0);
回答by rlemon
Or you could mix the two for optimal size. http://jsfiddle.net/HkEZ7/
或者您可以将两者混合以获得最佳尺寸。 http://jsfiddle.net/HkEZ7/
function roundMinutes(date) {
return date.getMinutes() >= 30 ? date.getHours() + 1 : date.getHours();
}
回答by JamesHalsall
Another solution, which is no where near as graceful as IAbstractDownvoteFactory's
另一个解决方案，它远不如 IAbstractDownvoteFactory 的优雅
var d = new Date();
if(d.getMinutes() >= 30) {
d.setHours(d.getHours() + 1);
}
d.setMinutes(0);
回答by Shubham Rai
Pass any cycle you want in milliseconds to get next cycle example 1 hours
以毫秒为单位传递您想要的任何周期以获得下一个周期示例 1 小时
function calculateNextCycle(interval) {
const timeStampCurrentOrOldDate = Date.now();
const timeStampStartOfDay = new Date().setHours(0, 0, 0, 0);
const timeDiff = timeStampCurrentOrOldDate - timeStampStartOfDay;
const mod = Math.ceil(timeDiff / interval);
return new Date(timeStampStartOfDay + (mod * interval));
}
console.log(calculateNextCycle(1 * 60 * 60 * 1000)); // 1 hours in milliseconds