refactor: [#297] added error checks

Error checks added to the function that converts the torrent creation date from seconds to
UTC human readable format.

Refactor to the function logic's code has been applied.

src/helpers/DateConverter.ts

@@ -1,15 +1,14 @@
 type UnixTime = number;
 
-/*
-  Takes the date in seconds from Epoch time and converts it to human readable format.
-  Date() can only work with integers between -8640000000000000 and 8640000000000000 to create a new Date object.
-*/
+function isValidDate (date: Date) {
+  return date instanceof Date && !isNaN(date.valueOf());
+}
+
+// Takes the date in seconds from Epoch time and converts it to human readable format.
 
 export function unixTimeToHumanReadableUTC (seconds: UnixTime) {
-  if (Number.isInteger(seconds) && seconds < 8640000000000000 && seconds > -8640000000000000) {
-    const milliseconds = seconds * 1000;
-    return new Date(milliseconds).toDateString();
-  } else {
-    return "Invalid date";
-  }
+  const milliseconds = seconds * 1000;
+  const convertedDate = new Date(milliseconds);
+
+  return isValidDate(convertedDate) ? convertedDate.toDateString() : "Invalid date";
 }