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Like date ranges, number ranges and page ranges should state the full value of both the beginning and end of the range, separated by an en dash: pp. 1902–1911 or entries 342–349. Except within quotations, avoid abbreviated forms such as 1902–11 or 342–9 , which are not understood universally, are sometimes ambiguous, and can cause ...
The en dash is commonly used to indicate a closed range of values – a range with clearly defined and finite upper and lower boundaries – roughly signifying what might otherwise be communicated by the word "through" in American English, or "to" in International English. [19] This may include ranges such as those between dates, times, or numbers.
They are used: in date ranges, such as 1849–1863, to join two names in a phrase, such as the Michelson–Morley experiment, in multi-part prefixes, such as "post–World War II", although for those, either a hyphen or an en dash can be used; British publications use hyphens, and American publications use en dashes. [dubious – discuss]
When dates of birth and death are known approximately. Rameses III (reigned c. 1180–c. 1150 BC) When only the dates of the reign are known and only approximately. Ranges of dates are given with a spaced or unspaced hyphen or en-dash (–). See Wikipedia:Manual of Style (dashes).
En dashes are used to stand for to or through in ranges: pp. 211–19, 64–75%, the 1939–45 war. In this use: In this use: The dash is usually unspaced, but if the elements being linked themselves contain spaces (as with full dates), then the dash is spaced.
The most common use of the en dash is the equivalent to “(up) to and including” when used between numbers, dates, and other notations that indicate range. 1984–85 8:30 a.m.–4:30 p.m. GS 12–14 Monday–Friday ages 10–15 levels D–G 35–40 years pages 128–34
How does the software know whether "150-355" is a range or an identification code of some kind? Of course linked date ranges could probably be identified, leaving the entities to other cases. But current suggestion seems to be that en-dash in a range should be represented by "--" and em-dash by "---" following TeX standard. Who knows?
Use an en dash, not a hyphen, between numbers: pp. 14–21; 1953–2008. An en dash is also used to connect parallel terms: red–green colorblind ; a New York–London flight . Use spaces around the en dash only if the connected terms are multi-unit dates: January 1999 – December 2000 .