19582021

19582021 is a concatenated numeral string used in various archival, data, and cataloging contexts as a composite year label. It does not designate a single historical period, but rather signals a pairing or span between two distinct years, most commonly 1958 and 2021. The term is not a standardized or widely recognized designation in mainstream historiography or metadata standards; instead, it appears sporadically in niche datasets, project codes, or catalog entries where dual-year information helps indicate relationships, revisions, or cross-era relevance.

In metadata practice, such composite year codes can serve several purposes. They may tag materials that originate in one year but receive notable attention, revision, or republication in another. They can also denote items that are conceptually linked across the two years, such as a work first published in 1958 and later reissued or analyzed in 2021, or datasets that pair events, artifacts, or documents from those years for comparative study. Because the meaning depends on context, readers should consult accompanying metadata or documentation to interpret the code correctly.

Notable characteristics include its ambiguity and variable application across institutions. The label is more a convenience in record-keeping than a reflection of a formal historical epoch. As such, it is primarily of interest to archivists, librarians, and data curators dealing with dual-year references. See also year range labeling, archival metadata standards, and concatenated year codes.