Show the time an SMS was sent, not received
It's a stupid setting of galaxy s sms' app. To resolve this you have to replace the mms.apk into /system/app with that attached in this thread of xda forum
http://forum.xda-developers.com/showthread.php?t=891667&amp;highlight=mod+sms
If you look all the thread, you can also find the complete installation guide!