19101999

19101999 is an eight-digit numeral that is commonly read as a date in the DDMMYYYY format, corresponding to 19 October 1999. In other conventions it can be interpreted as 1999-10-19 (ISO 8601) or 10/19/1999 (MMDDYYYY), depending on regional or system settings. Because of these differences, 19101999 may be ambiguous without explicit formatting.

In data handling, 19101999 is sometimes used as a compact date stamp or identifier in filenames, records, or databases. It is part of a broader family of numeric date codes that compress a calendar date into a single string, a practice that can facilitate sorting but also create confusion when shared across systems with differing conventions.

To avoid misinterpretation, many standards advocate using unambiguous date formats such as YYYY-MM-DD or including separators like slashes or hyphens. When representing 19 October 1999 in such a standard, the form 1999-10-19 is recommended.