allow for opening of files with corrupt create and/or modify dates.

[FaustinCarter]

Older versions of Layout Editor (i.e. the last free version before a license was required) inject a bogus date and time into the BGNLIB record. This can't be parsed by datetime and so it fails and crashes. This is a workaround to allow for non-parseable entries in that record. If it is unable to parse, it replaces the entry with datetime.datetime.today().

What other programs do with BGNLIB data:

• KLayout offers the option to not write anything to those fields, or to update them at write time. It doesn't attempt to parse them in any way though on read.
• Layout Editor circa 2008/2009 does something strange and stupid on write, and ignores on read.
• gdspy reads in whatever is there, but doesn't try anything fancy with it (i.e. parsing).