Event that is always highly annoying. How do you deal with (for example) Dutch decimal numbers, which use the comma for decimal separation, or numbers with a comma as a thousands separator?
'Dutch' notation can usually be distinguished with enough context (i.e. if the number has decimals), or by comparing it to other numbers found in a file.
But don't get me started on people mixing American date notation and ISO notation. Especially mixing the separators.
If you ever have to work with date notations, use a hyphen as a separator for ISO, and use a forward slash (/) when using American notation. It's the only way to distinguish dates before the 13th day of the month.
