19XX

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19XX is a placeholder year. Alternate versions include 19??, 19xx, 19—, 19__, etc.

Some uses

Fiction

The use of 19xx is common in fiction to indicate that the events in the work will take place in the near future, or took place during a specific century. By doing this, the author tries to increase the sense of realism.

Fill-in-the-blank

The convention is also used on demonstration memos and other paperwork instead of a real date, or, as "19__", for later entry of the actual year. This can be seen on bank checks.

Other centuries

For literature set in the past, any century is substitutable for "19XX", such as Treasure Island's "17__" or Dr. Jekyll and Mr. Hyde's "18--". For current use "20XX" has replaced 19XX in the new millennium.