From 55b95489f371b53ac5369f2f2d19f66a4d8ef1a7 Mon Sep 17 00:00:00 2001
From: Nick Craig-Wood <nick@craig-wood.com>
Date: Fri, 17 Jul 2026 08:47:31 +0100
Subject: [PATCH] imagekit: add mtime to the available metadata

The backend declares ReadMetadata but did not return the standard
mtime key, so the modification time was missing from the metadata.
---
 backend/imagekit/imagekit.go | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/backend/imagekit/imagekit.go b/backend/imagekit/imagekit.go
index 0c8521d0d..44c193ec8 100644
--- a/backend/imagekit/imagekit.go
+++ b/backend/imagekit/imagekit.go
@@ -32,6 +32,12 @@ const (
 )
 
 var systemMetadataInfo = map[string]fs.MetadataHelp{
+	"mtime": {
+		Help:     "Time of last modification, read from the file's updatedAt field",
+		Type:     "RFC 3339",
+		Example:  "2006-01-02T15:04:05.999999999Z07:00",
+		ReadOnly: true,
+	},
 	"btime": {
 		Help:     "Time of file birth (creation) read from Last-Modified header",
 		Type:     "RFC 3339",
@@ -759,6 +765,7 @@ func uploadFile(ctx context.Context, f *Fs, in io.Reader, srcRemote string, opti
 // Metadata returns the metadata for the object
 func (o *Object) Metadata(ctx context.Context) (metadata fs.Metadata, err error) {
 
+	metadata.Set("mtime", o.file.UpdatedAt.Format(time.RFC3339Nano))
 	metadata.Set("btime", o.file.CreatedAt.Format(time.RFC3339))
 	metadata.Set("size", strconv.FormatUint(o.file.Size, 10))
 	metadata.Set("file-type", o.file.FileType)