Web and technology
LDML
Abbreviation for Locale Data Markup Language
In short and in plain language
LDML is a rule set of the Unicode group.
It says how programs show dates and numbers for each country.
If you mix up signs in it, you may get a wrong year at New Year.
Definition
LDML is a standard of the Unicode Consortium that describes how programs display dates, numbers and languages for each country and region. It also defines placeholders for date formats, for example for the year of a calendar week. Mixed-up placeholders can produce a wrong year at the turn of the year.