fix(timestamp): add missing .isOlderThanOtherTimeStamp() to TimeStamp class

ts/smarttime.classes.timestamp.ts

@@ -53,6 +53,19 @@ export class TimeStamp {
     this.epochtime = Math.floor(this.milliSeconds / 1000);
   }
 
+  /**
+   * returns a boolean for wether the timestamp is older than another timestamp
+   * @param TimeStampArg
+   * @param tresholdTimeArg
+   */
+  public isOlderThanOtherTimeStamp(TimeStampArg: TimeStamp, tresholdTimeArg: number = 0) {
+    if (this.milliSeconds < TimeStampArg.milliSeconds - tresholdTimeArg) {
+      return true;
+    } else {
+      return false;
+    }
+  }
+
   /**
    * Is the current instance older than the argument
    * @param TimeStampArg
@@ -66,7 +79,7 @@ export class TimeStamp {
   }
 
   /**
-   * returns a boolean for wether a timestamp is younger
+   * returns a boolean for wether the timestamp is younger than another timestamp
    * @param TimeStampArg
    * @param tresholdTimeArg
    */