I believe it is the default date format used in Japan.

To bring it back to the topic, I have an amusing story to share. This morning, Filebox bricked my N900. How did that happen, I hear you ask. Well, I was trying to copy a folder with about 2GB of data from the SD card to the main memory using Filebox. I went click and hold on the folder, select copy. Navigate to the destination, select paste, BANG! The device rebooted. It ended up in a reboot loop because I had moved my swap to the second partition on that SD card. Good old Bootmenu! I was able to boot to the console and switch back to the original swap. After that the deviuce sprang back to life but the SD card was busted. No partition table. This happened with no access to an alternative SD card reader so I will have to wait a bit to assess the extent of the damage and see if I can rescue any data. I had some family pictures on it not yet copied anywhere else.