javascript 在javascript中将军事时间转换为标准时间的最佳方法
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Best way to convert military time to standard time in javascript
提问by Lee Lee
What is the best way to convert military time to am and pm time. . I have the following code and it works fine:
将军事时间转换为上午和下午时间的最佳方法是什么？. 我有以下代码，它工作正常：
$scope.convertTimeAMPM = function(time){
//var time = "12:23:39";
var time = time.split(':');
var hours = time[0];
var minutes = time[1];
var seconds = time[2];
$scope.timeValue = "" + ((hours >12) ? hours -12 :hours);
$scope.timeValue += (minutes < 10) ? ":0" : ":" + minutes;
$scope.timeValue += (seconds < 10) ? ":0" : ":" + seconds;
$scope.timeValue += (hours >= 12) ? " P.M." : " A.M.";
//console.log( timeValue);
}
But I am not satisfied in the output shows when I run my program. .
但是当我运行我的程序时，我对输出显示并不满意。.
Sample output:
示例输出：
20:00:00 8:0:0 P.M.
08:00:00 08:0:0 A.M
16:00:00 4:30:0 P.M.
I want to achieve the output which looks like the following:
我想实现如下所示的输出：
20:00:00 8:00:00 P.M.
08:00:00 8:00:00 A.M
16:30:00 4:30:00 P.M.
Is there any suggestions there? Thanks
有什么建议吗？谢谢
回答by Rahul Desai
You missed concatenating the string when minutes < 10and seconds < 10so you were not getting the desired result.
您错过了连接字符串的时间minutes < 10，seconds < 10因此您没有获得所需的结果。
Convert string to number using Number()and use it appropriately as shown in the working code snippet below:
使用将字符串转换为数字Number()并适当地使用它，如下面的工作代码片段所示：
EDIT:Updated code to use Number()while declaration of hours, minutesand seconds.
编辑：更新代码以使用Number()while 声明hours,minutes和seconds。
var time = "16:30:00"; // your input
time = time.split(':'); // convert to array
// fetch
var hours = Number(time[0]);
var minutes = Number(time[1]);
var seconds = Number(time[2]);
// calculate
var timeValue;
if (hours > 0 && hours <= 12) {
timeValue= "" + hours;
} else if (hours > 12) {
timeValue= "" + (hours - 12);
} else if (hours == 0) {
timeValue= "12";
}
timeValue += (minutes < 10) ? ":0" + minutes : ":" + minutes; // get minutes
timeValue += (seconds < 10) ? ":0" + seconds : ":" + seconds; // get seconds
timeValue += (hours >= 12) ? " P.M." : " A.M."; // get AM/PM
// show
alert(timeValue);
console.log(timeValue);Read up: Number()| MDN
回答by Huy Hoang Pham
As Nit recommend, Moment.js provides a simple solution to your problem.
正如 Nit 推荐的那样，Moment.js 为您的问题提供了一个简单的解决方案。
function convert(input) {
return moment(input, 'HH:mm:ss').format('h:mm:ss A');
}
console.log(convert('20:00:00'));
console.log(convert('08:00:00'));
console.log(convert('16:30:00'));<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.9.0/moment.js"></script>回答by Arlo
No need for a library
不需要图书馆
Here's a sweet & simple function I whipped up that should suit your needs exactly
这是我创建的一个甜蜜而简单的功能，它应该完全满足您的需求
function toStandardTime(militaryTime) {
militaryTime = militaryTime.split(':');
return (militaryTime[0].charAt(0) == 1 && militaryTime[0].charAt(1) > 2) ? (militaryTime[0] - 12) + ':' + militaryTime[1] + ':' + militaryTime[2] + ' P.M.' : militaryTime.join(':') + ' A.M.'
}
console.log(toStandardTime('16:30:00'));And a more readable version in case it's needed
以及一个更易读的版本，以备不时之需
function toStandardTime(militaryTime) {
militaryTime = militaryTime.split(':');
if (militaryTime[0].charAt(0) == 1 && militaryTime[0].charAt(1) > 2) {
return (militaryTime[0] - 12) + ':' + militaryTime[1] + ':' + militaryTime[2] + ' P.M.';
} else {
return militaryTime.join(':') + ' A.M.';
}
}
console.log(toStandardTime('16:30:00'));