In the en-US locale, the toLocaleDateString function is transforming "00:30" into 24:30

Questioning the Conversion of Time from 00:30 to 24:30 in en-US Locale

options = {
        year: "numeric",
        day: "numeric",
        month: "numeric",
        hour: '2-digit',
        minute: '2-digit',
        hour12: false
      }
    
    let actualDate = value;
    if (typeof value == "string") { actualDate = new Date(value); }
     //even when using this code, it still displays 24:30 for 00:30
    var time = actualDate.toLocaleTimeString('en-US', { hour: '2-digit', minute: '2-digit', hour12: false}); 
    //the same issue occurs with date and time where 24:30 is converted into 00:30
    actualDate.toLocaleDateString('en-US', options);

However, when changing the locale to 'en-GB' (English United Kingdom) the correct time 00:30 for 00:30 is displayed.

    var time = actualDate.toLocaleTimeString('en-US', { hour: '2-digit', minute: '2-digit', hour12: false}); 
 
    actualDate.toLocaleDateString('en-US', options);

This inconsistency is causing confusion. The concept of a time like 24:30 (which would be equivalent to 12:30 AM in a 24-hour format) seems peculiar according to English in the United States. Is there any validity to the existence of 24:30 under US English conventions?

Answer №1

If you're looking to change the hour system format in JavaScript, consider utilizing the hourCycle property.

The Intl.Locale.prototype.hourCycle property serves as a means to retrieve the time keeping format convention specific to the locale.

h23 Hour system using 0–23; this corresponds to 'H' in patterns. Essentially, this refers to the 24-hour clock where midnight starts at 0:00.

var time = actualDate.toLocaleTimeString('en-US', { hour: '2-digit', minute: '2-digit', hourCycle: "h23"});

Keep in mind that the default format for en-US locale typically includes AM/PM (hour12 or hourCycle: "h12"), so by specifying "h23," you might be overriding that default setting.

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