How to get User Locale information in Lightning Components

Lightning framework provide $Locale which can be used to get current user preferred locale. For example you can get user preferred timezone, language, currency format etc.

In Spring'19, Salesforce introduces new date-time $Locale attributes for date- time formattingas mentioned below:

• longDateFormat ("MMMM d, yyyy")                              
• shortDateFormat ("M/d/yyyy")
• shortDatetimeFormat ("M/d/yyyy h:mm a")
• shortTimeFormat ("h:mm a")

You can refer this global variable either directly in lightning component markup or in controller.js  file.

Below is sample code:

	<aura:application extends="force:slds">
	<c:SK_UserLocaleInfoCmp/>
	</aura:application>

view raw SK_UserLocaleInfoApp.app hosted with ❤ by GitHub

	<aura:component>
	<div style="background-color:#E6E6FA;border-style: solid;margin:5%;padding:2%;">
	<b>Getting User Locale Information in Lightning Component Markup</b>
	<table>
	<tr>
	<td>Country</td><td>{!$Locale.country}</td>
	</tr>
	<tr>
	<td>Timezone</td><td>{!$Locale.timezone}</td>
	</tr>
	<tr>
	<td>Currency</td><td>{!$Locale.currency}</td>
	</tr>
	<tr>
	<td>Long Date Format</td><td>{!$Locale.longDateFormat}</td>
	</tr>
	</table>
	</div>
	<aura:attribute type="String" name="ltngCurrencyCode"/>
	<aura:handler name="init" value="{!this}" action="{!c.doInit}"/>
	<div style="background-color:#E6E6FA;border-style: solid;margin:5%;padding:2%;">
	<b>Getting User Locale Information from Controller.js</b>
	<table>
	<tr>
	<td>Currency Code</td><td>{!v.ltngCurrencyCode}</td>
	</tr>
	</table>
	</div>
	</aura:component>

view raw SK_UserLocaleInfoCmp.cmp hosted with ❤ by GitHub

	({
	doInit : function(component, event, helper) {
	var currCode = $A.get("$Locale.currencyCode");
	component.set("v.ltngCurrencyCode",currCode);
	}
	})

view raw SK_UserLocaleInfoCmpController.js hosted with ❤ by GitHub

Snapshot of lightning component

For detailed information on Locale global variable, please refer below URL:
$Locale in Lightning Component

Hope this will help!!!