DDMMJJJJ

ddmmjjjj is a notation used to describe a date format that orders day, month, and a four-digit year without or with minimal separators. In this scheme, dd represents the day of the month (01–31), mm the month (01–12), and jjjj the year written with four digits. The term “jjjj” is a convention found in some European documentation where J stands for Jahr, meaning year, and four digits are required to avoid ambiguity with two-digit years.

Usage and context

ddmmjjjj appears in forms, databases, and legacy data schemas where a compact, non-ambiguous year representation is desired. It is common in environments that prefer a fixed-width, separator-free date field, though many systems also support common separators such as dd.mm.jjjj or dd-mm-jjjj. It is important to note that ddmmjjjj is not a universal standard; other regions may use different orderings such as mmddjjjj or yyyymmdd.

Formatting considerations

Because ddmmjjjj can affect data sorting, its interpretation varies by implementation. In raw form, dates with this order sort primarily by day, then by month, then by year, which is not ideal for chronological sorting. When interoperability or sorting is required, ISO 8601 (yyyy-mm-dd) or a fixed-width, zero-padded representation with a year-first order is often preferred.

Examples

01012025 denotes 1 January 2025, and 31122099 denotes 31 December 2099. With separators, 01.01.2025 or 01-01-2025 may be used depending on locale.

See also

ddmmyyyy, mmddyyyy, yyyymmdd, ISO 8601, date format.