Always use en-US as locale when creating status reporter

Author: sheetalkamat

src/compiler/tsbuild.ts

@@ -314,9 +314,12 @@ namespace ts {
     /**
      * Create a function that reports watch status by writing to the system and handles the formating of the diagnostic
      */
-    export function createBuilderStatusReporter(system: System, pretty?: boolean): DiagnosticReporter {
+    export function createBuilderStatusReporter(system: System, pretty?: boolean): DiagnosticReporter;
+    /*@internal*/
+    export function createBuilderStatusReporter(system: System, pretty?: boolean, locale?: string): DiagnosticReporter;  // eslint-disable-line @typescript-eslint/unified-signatures
+    export function createBuilderStatusReporter(system: System, pretty?: boolean, locale?: string): DiagnosticReporter {
         return diagnostic => {
-            let output = pretty ? `[${formatColorAndReset((system.now ? system.now() : new Date()).toLocaleTimeString(), ForegroundColorEscapeSequences.Grey)}] ` : `${(system.now ? system.now() : new Date()).toLocaleTimeString()} - `;
+            let output = pretty ? `[${formatColorAndReset((system.now ? system.now() : new Date()).toLocaleTimeString(locale), ForegroundColorEscapeSequences.Grey)}] ` : `${(system.now ? system.now() : new Date()).toLocaleTimeString(locale)} - `;
             output += `${flattenDiagnosticMessageText(diagnostic.messageText, system.newLine)}${system.newLine + system.newLine}`;
             system.write(output);
         };

src/testRunner/unittests/tsc/helpers.ts

@@ -130,7 +130,7 @@ namespace ts {
             sys,
             /*createProgram*/ undefined,
             reportDiagnostic,
-            createBuilderStatusReporter(sys, buildOptions.pretty),
+            createBuilderStatusReporter(sys, buildOptions.pretty, "en-US"),
             createReportErrorSummary(sys, buildOptions)
         );
         fakes.patchSolutionBuilderHost(buildHost, sys);