Build-timestamp is US date-format

[lurch]

Because of https://github.com/raspberrypi/noobs/blob/master/BUILDME.sh#L30 the build-timestamp file looks like e.g. BUILT-05-27-2013

Please consider changing it to the UK date-format DD-MM-YYYY, or even better adopt the ISO date-format YYYY-MM-DD

[popcornmix]

I'd vote for ISO format. It's unambiguous. It's what we use for wheezy images.

[lurch]

Something else that just occurred to me - instead of leaving this file as empty, maybe it could include extra information, e.g. the git hashes of the firmware, kernel and noobs repos that got used to build the NOOBS image.

[Rob-Bishop]

@lurch if you'd like to contribute a pull request to add this functionality, I would happily accept it.

@popcornmix I'll change the date-format to ISO.

[lurch]

I started investigating the git hashes of included buildroot packages, and I believe I've found a bug in the upstream buildroot project https://bugs.busybox.net/show_bug.cgi?id=6302
Once that gets confirmed/denied I'll come back to investigating storing selected git hashes in the (now ISO-formatted) build-timestamp file...