moment.js 检查系统时间格式是 12 小时还是 24 小时？

Question

How to get the current system setting time format if 12 hours or 24 hours?

date.toLocaleTimeString does not work always return time in 12 hours.

I need to display time on the basis of the system's time format.

example:

  let currentDateTime = new Date();
  console.log(currentDateTime.toLocaleTimeString())

result:

7:50:00 PM

I'm expecting 19:50:00 because my current system settings is 24hours format in my computer. see image:

Answer 1

for 24 hours you can make 12 hours false like this:

 let currentDateTime = new Date(); console.log(currentDateTime.toLocaleTimeString('en-US', { hour12: false }))

Answer 2

A Simple approach using moment.js

function is12HourFormat(time: string): boolean {
    return moment(time, 'hh:mm', true).isValid();
}

For 24 hour format:

function is24HourFormat(time: string): boolean {
    return moment(time, 'HH:mm', true).isValid();
}