diff --git a/proxmox-time/src/time_span.rs b/proxmox-time/src/time_span.rs
index 9eea3f28..6081a534 100644
--- a/proxmox-time/src/time_span.rs
+++ b/proxmox-time/src/time_span.rs
@@ -128,8 +128,8 @@ pub struct TimeSpan {
     pub years: u64,
 }
 
-impl From<TimeSpan> for f64 {
-    fn from(ts: TimeSpan) -> Self {
+impl From<&TimeSpan> for f64 {
+    fn from(ts: &TimeSpan) -> Self {
         (ts.seconds as f64)
             + ((ts.nsec as f64) / 1_000_000_000.0)
             + ((ts.usec as f64) / 1_000_000.0)
@@ -143,6 +143,12 @@ impl From<TimeSpan> for f64 {
     }
 }
 
+impl From<TimeSpan> for f64 {
+    fn from(ts: TimeSpan) -> Self {
+        Self::from(&ts)
+    }
+}
+
 impl From<std::time::Duration> for TimeSpan {
     fn from(duration: std::time::Duration) -> Self {
         let mut duration = duration.as_nanos();