javascript 如何使用javascript将时间从24小时格式转换为12小时格式？
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How to convert time from 24 hour format to 12 hour format using javascript?
提问by saran
The function returns the time in 24 hour format.
该函数以 24 小时格式返回时间。
function fomartTimeShow(h) {
return h < 10 ? "0" + h + ":00" : h + ":00";
}
returns the time in 24 hour format. I want the time to be converted in 12 hour format.
Anyhelp would be greatly appreciated.
Thanks.
以 24 小时格式返回时间。我希望将时间转换为 12 小时格式。
任何帮助将不胜感激。
谢谢。
回答by Ben Lee
Just use modulus 12:
只需使用模数 12：
function formatTimeShow(h_24) {
var h = h_24 % 12;
return (h < 10 ? '0' : '') + h + ':00';
}
Modulus (%) means divide and take remainder. For example 17 / 12 = 1 with remainder 5. So the result of 17 % 12 is 5. And hour 17 is hour 5 in 12-hour time.
Modulus ( %) 表示除以取余。例如 17 / 12 = 1 余数为 5。所以 17 % 12 的结果是 5。17 小时是 12 小时的第 5 小时。
But note that this function is not complete since it doesn't work for hour 0 (or hour 12). To fix it you have to add in another check for that:
但请注意，此功能并不完整，因为它在 0 小时（或 12 小时）内不起作用。要修复它，您必须为此添加另一项检查：
function formatTimeShow(h_24) {
var h = h_24 % 12;
if (h === 0) h = 12;
return (h < 10 ? '0' : '') + h + ':00';
}
Also note that you can add a meridian easily, by seeing whether the hour is less than 12 (am) or equal to/greater (pm):
另请注意，您可以通过查看小时是否小于 12 (am) 或等于/大于 (pm) 来轻松添加子午线：
function formatTimeShow(h_24) {
var h = h_24 % 12;
if (h === 0) h = 12;
return (h < 10 ? '0' : '') + h + ':00' + (h_24 < 12 ? 'am' : 'pm');
}
Note: All of the above is assuming the parameter to this function is an integer between 0 and 23.
注意：以上所有内容均假设此函数的参数是 0 到 23 之间的整数。
回答by K Griffiths
You could try something like the following:
您可以尝试以下操作：
function fomartTimeShow(h) {
var ampm = "am"
if (h >= 12)
ampm = "pm"
h = h % 12;
if (h == 0)
h = 12;
return h ":00" + ampm;
}
回答by Diode
function fomartTimeShow(h) {
var s = (h % 24 < 12) ? "am" : "pm", h = h % 12 || 12;
return (h < 10 ? "0" + h : h) + ":00" + " " + s;
}
回答by Ravi Agrawal
In case if you are getting time like this "16:26", "12:50", "05:23", etc. Then, you can easily convert them into 12 hour format like "4:26 PM", "12:50 PM", "05:23 AM", etc. with AM/PM through this function.
如果您有这样的时间"16:26", "12:50", "05:23"等，那么您可以轻松地将它们转换为 12 小时格式，如"4:26 PM"、"12 :50 PM", "05:23 AM"等通过此功能与 AM/PM。
function convertTo12Hour(oldFormatTime) {
console.log("oldFormatTime: " + oldFormatTime);
var oldFormatTimeArray = oldFormatTime.split(":");
var HH = parseInt(oldFormatTimeArray[0]);
var min = oldFormatTimeArray[1];
var AMPM = HH >= 12 ? "PM" : "AM";
var hours;
if(HH == 0){
hours = HH + 12;
} else if (HH > 12) {
hours = HH - 12;
} else {
hours = HH;
}
var newFormatTime = hours + ":" + min + " " + AMPM;
console.log(newFormatTime);
}
回答by BobH
I'm pretty sure this will work as an even more concise formulaic version of Ben Lee's answer, including for the h=0 and h=12 cases:
我很确定这将作为 Ben Lee 答案的更简洁的公式版本起作用，包括 h=0 和 h=12 情况：
function fomartTimeShow(h_24) {
var h = ((h_24 + 11) % 12)+1;
return (h < 10 ? '0' : '') + h + ':00';
}
or including am/pm:
或包括上午/下午：
function fomartTimeShow(h_24) {
var h = ((h_24 + 11) % 12)+1;
return (h < 10 ? '0' : '') + h + ':00' + (h_24 < 12 ? 'am' : 'pm');
}
