18011900

18011900 is an eight-digit numeric string that most commonly denotes a calendar date in the ddmmyyyy format, corresponding to 18 January 1900. In ISO 8601, the same date is written as 1900-01-18. The strict ddmmyyyy interpretation implies day 18, month 01, year 1900; other common date formats would misread it (for example, mmddyyyy cannot represent a valid month as 18).

In archival and information-management contexts, such compact dates appear in catalogs, metadata records, and file-naming schemes where separators are omitted for space or machine-readability. When used as a date field in databases or filenames, 18011900 often signals the creation or reference date of a document or entry. However, without accompanying context, the sequence carries no intrinsic meaning beyond representing that specific date.

Historically, 1900 marks the turn from the 19th to the 20th century, a period of rapid modernization, colonial expansion, and cultural change in many regions. Specific significance for the date 18 January 1900 varies by locale and source and is not universally tied to a singular, widely recognized event.

As a formatting example, 18011900 is sometimes used in demonstrations of date encoding, data entry, or software test cases to illustrate eight-digit date representations and their potential interpretations across systems.