diff --git a/web/src/lib/components/asset-viewer/detail-panel.svelte b/web/src/lib/components/asset-viewer/detail-panel.svelte
index c968c986a8..4361da207b 100644
--- a/web/src/lib/components/asset-viewer/detail-panel.svelte
+++ b/web/src/lib/components/asset-viewer/detail-panel.svelte
@@ -307,6 +307,7 @@
                     weekday: 'short',
                     hour: 'numeric',
                     minute: '2-digit',
+                    second: '2-digit',
                     timeZoneName: timeZone ? 'longOffset' : undefined,
                   },
                   { locale: $locale },
diff --git a/web/src/lib/components/shared-components/change-date.svelte b/web/src/lib/components/shared-components/change-date.svelte
index f7acf06890..930bafd599 100644
--- a/web/src/lib/components/shared-components/change-date.svelte
+++ b/web/src/lib/components/shared-components/change-date.svelte
@@ -88,7 +88,7 @@
 
   const userTimeZone = Intl.DateTimeFormat().resolvedOptions().timeZone;
 
-  let selectedDate = $state(initialDate.toFormat("yyyy-MM-dd'T'HH:mm"));
+  let selectedDate = $state(initialDate.toFormat("yyyy-MM-dd'T'HH:mm:ss.SSS"));
   // Use a fixed modern date to calculate stable timezone offsets for the list
   // This ensures that the offsets shown in the combobox are always current,
   // regardless of the historical date selected by the user.
@@ -106,7 +106,7 @@
     const { offsetMinutes, offsetFormat: zoneOffsetAtDate } = getModernOffsetForZoneAndDate(zone, date);
     // For validity, we still need to check if the exact date/time exists in the *original* timezone (for gaps/overlaps).
     const dateForValidity = DateTime.fromISO(date, { zone });
-    const valid = dateForValidity.isValid && date === dateForValidity.toFormat("yyyy-MM-dd'T'HH:mm");
+    const valid = dateForValidity.isValid && date === dateForValidity.toFormat("yyyy-MM-dd'T'HH:mm:ss.SSS");
     return {
       value: zone,
       offsetMinutes,
diff --git a/web/src/lib/elements/DateInput.svelte b/web/src/lib/elements/DateInput.svelte
index a93d2e7cb8..c328a6c036 100644
--- a/web/src/lib/elements/DateInput.svelte
+++ b/web/src/lib/elements/DateInput.svelte
@@ -34,4 +34,5 @@
     }
     onkeydown?.(e);
   }}
+  step=".001"
 />