199905

199905 is a numeric string that most often denotes a calendar period or date in the YYYYMM format, representing May 1999. In computing and data management, such a compact representation is used to encode year and month without separators, enabling simple sorting and indexing.

In data systems, 199905 can function as a date key, a partition label, or a period indicator in tables, reports, and logs. It supports efficient chronological ordering and can be combined with other identifiers to form composite keys. Because it eliminates punctuation, it is a common choice for filenames, batch identifiers, and archival codes where space or formatting constraints exist.

Outside date-related use, 199905 may appear as a catalog number, model identifier, or internal code in product inventories, library systems, or content repositories. In these contexts, the meaning of 199905 depends on the issuing organization, and the same string could refer to a version, batch, or item rather than a date.

Ambiguity can arise without context, since 199905 by itself does not convey a universal interpretation. When encountered, practitioners typically determine its intended meaning from accompanying metadata, documentation, or the system in which it appears.

See also: date formats, YYYYMM, 1999, May 1999.