s3sync puts files each time from local

[johnsyn]

I setup s3sync under Windows XP SP3, the first sync goes well. But when I launch it again, it puts all *same* files again. I turned on the -d option and it reports as following:

local item S:/Backup/test/program.txt
local node object init. Name:program.txt Path:S:/Backup/test/program.txt Size:37
50 Tag:39b546349c190ad25865182c21b5db81 Date:Wed Nov 11 10:34:33 UTC 2009
source: program.txt
s3 node object init. Name:program.txt Path:test/program.txt Size: Tag: Date:
Create node program.txt
test/program.txt
File extension: txt
Trying command put myprivate test/program.txt #<S3::S3Object:0x4f70b58> Cont
ent-Length 3750 with 100 retries left
Response code: 200

I read the s3sync.rb source code and found it comparing date/size/tag of remote and local files. It looks s3sync can not retrieve remote date/size/tag from s3 so it think local files are always new, how do I solve this problem?

[Admin]

Can you send the entire -d output instead of only the part you sent?  Also the exact command string you used.