Use timestamp/millisecond based math for checking expiration.

Author: brnkrygs

Diff for: packages/parameters/src/ExpirableValue.ts

@@ -4,10 +4,17 @@ class ExpirableValue implements ExpirableValueInterface {
   public ttl: number;
   public value: string | Uint8Array | Record<string, unknown>;
 
+  /**
+   * Creates a new cached value which will expire automatically
+   * @param value Parameter value to be cached
+   * @param maxAge Maximum number of seconds to cache the value for
+   */
   public constructor(value: string | Uint8Array | Record<string, unknown>, maxAge: number) {
     this.value = value;
-    const timeNow = new Date();
-    this.ttl = timeNow.setSeconds(timeNow.getSeconds() + maxAge);
+
+    const maxAgeInMilliseconds = maxAge * 1000;
+    const nowTimestamp = Date.now();
+    this.ttl = nowTimestamp + maxAgeInMilliseconds;
   }
 
   public isExpired(): boolean {