FormatTime function to submodule (#17)

* FormatTime function to submodule

* PR comments

Author: lumburovskalina

date-parser.ts

@@ -32,4 +32,10 @@ export function isValidDate(date: string) {
 
 export function timeDiffCalc(dateA: any, dateB: any = Date.now()) {
     return new Date(Math.abs(dateB - dateA)).toISOString().substring(11, 19);
+}
+
+export function formatTimeDigitalClock(s: number) {
+    const mm = Math.floor(s / 60);
+    const ss = s % 60;
+    return `${String(mm).padStart(2, "0")}:${String(ss).padStart(2, "0")}`;
 }