DDMM

ddmm is a four-character sequence used in date notation and data formatting in some systems. In this usage, the first two digits represent the day of the month and the last two digits represent the month, forming a numeric pattern such as 0509 for 5 September or 2311 for 23 November. The pattern is frequently encountered as part of a larger date format, sometimes without a year.

In programming and data processing, ddmm appears in format strings or input masks. Many languages treat dd as day of month and MM as month, so a formatter specifying "ddMM" will produce or require two-digit values for day and month. It is common to combine ddMM with a year, as in ddMMyyyy, to form a complete date. When used without a separator, ddMM is concise but can be ambiguous without a defined year or locale.

Ambiguity and locale: Because day and month order varies by region (for example, day-month vs month-day conventions), a bare ddMM value can be misinterpreted. To reduce errors, systems often include a year or introduce a clear separator such as dd-MM or dd/MM/yyyy.

Other uses: Outside date handling, ddmm rarely serves as a stand-alone term, and when encountered as an acronym its meaning is context-dependent. In documentation, ddmm is typically described as a date-related pattern rather than a separate concept.