1 files changed, 7 insertions, 0 deletions
diff --git a/packages/taler-wallet-core/src/util/time.ts b/packages/taler-wallet-core/src/util/time.ts
index 512d5e908..1f085107f 100644
--- a/packages/taler-wallet-core/src/util/time.ts
+++ b/packages/taler-wallet-core/src/util/time.ts
@@ -144,6 +144,13 @@ export function durationMax(d1: Duration, d2: Duration): Duration {
   return { d_ms: Math.max(d1.d_ms, d2.d_ms) };
 }
 
+export function durationMul(d: Duration, n: number): Duration {
+  if (d.d_ms === "forever") {
+    return { d_ms: "forever" };
+  }
+  return { d_ms: Math.round( d.d_ms * n) };
+}
+
 export function timestampCmp(t1: Timestamp, t2: Timestamp): number {
   if (t1.t_ms === "never") {
     if (t2.t_ms === "never") {