ISO 8601 is a great standard when you need interoperability (e.g. between machines/servers, or between humans in different locales) or the ability to sort by ti

ISO 8601 is a great standard when you need interoperability (e.g. between machines/servers, or between humans in different locales) or the ability to sort by timestamp. For personal note taking, or notes to be shared locally, it makes sense to use your local locale's format.