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How do I find the build date?
Last sector of the BootROM, starting with 0x3fff50.

BD of this Mac below is 20090228.
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How do I find the build date?

:edit: found it. March 2, 2009
If you bought it March 3, it can't be produced at March 2. Did you looked at the serial number to get the build date? If so, it's not the correct date.
 
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CoconutBattery reported March 2. I bought it stock with no config changes, so I figured it was on an assembly line somewhere and they just packed it up in the box and shipped it to me.
 
CoconutBattery reported March 2. I bought it stock with no config changes, so I figured it was on an assembly line somewhere and they just packed it up in the box and shipped it to me.
It's an approximation based on first day of the week that the Mac came out of the production line. Apple used it to add salt into the Serial Number, but it's not the real build date. Sometimes the date from the serial number is a month later than the BD.

If you want to know the correct BD, do a dump with ROMTool and check the offset 0x3fff50.
 
They're ageing quite nicely though, aren't they? Mine has been doing some OS nostalgia today: I've had OS9 on SheepShaver ever since I got my 1,1 back in 2006, yesterday I installed NeXTStep on VirtualBox, today I've got VB running Snow Leopard Server. All running simultaneously with not a hitch!
 
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