19990919

19990919 is a numeric date string used to denote September 19, 1999. In the YYYYMMDD format, the year is written first, followed by the month and day without separators. This compact form is commonly used in computing, data storage, and archival systems because it sorts chronologically when treated as a plain number.

Origins and usage: The pattern is derived from the broader use of ISO-like date representations in databases, file naming, and logs. It is especially prevalent in systems that require sortable, machine-friendly identifiers or where separators are undesirable. When written with separators as 1999-09-19, it aligns with the ISO 8601 standard; many software libraries can parse both forms, though some locales may interpret ambiguous dates differently.

Practical applications: File names may include 19990919 to indicate creation or version dates; batch processes might stamp records with such dates; data exports and backups often adopt this format to ensure consistent ordering. The numeric form reduces locale-based confusion when exchanging data across regions.

Limitations: Without separators, readability is reduced for humans and could be mistaken for other yyyymmdd-like strings if digits are rearranged. In systems that use this format, accompanying metadata or explicit format documentation helps prevent misinterpretation.

See also: 1999 (year), ISO 8601, YYYYMMDD, 1999-09-19.