I used rclone to successfully clone a bucket from Amazon S3 to Cloudflare R2. However, the modified dates of the files were not preserved. Is that a limitation of Cloudflare R2? Or is there a config setting I can make to keep modified dates? 
The modified date is stored as metadata on the object, and I think this should copy across just fine.
Did you do the copy with rclone? If so which flags did you use?
Alternatively if you are using
--use-server-modtime Use server modified time instead of object metadata
That is a property of the object which can't be modified.
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Thanks, you're right there is an mtime custom metadata attribute written out. I was just surprised it was in custom metadata, but I guess r2 has no standard attribute for modified date
mtime is the nearest we've got to a standard. It's a shame aws didn't define it in the protocol.
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