In ranges that might otherwise be expressed with to or through Wikipedia:Manual of Style

pp. 7–19;   64–75%;   henry viii reigned 1509–1547

do not change hyphens dashes in filenames, urls or templates {{bibleverse}}, formats verse ranges urls.

do not mix en dashes between or from.

450–500 people
between 450 , 500 people, not between 450–500 people
from 450 500 people, not 450–500 people
from 1961 1962, not 1961–62
between 1961–62 , 1967–68 seasons, ticket sales dropped substantially

if negative values involved, en dash might confusing. use words instead.

−10 10, not −10–10

the en dash in range unspaced, except when either or both elements of range include @ least 1 space.

july 23, 1790 – december 1, 1791 (not july 23, 1790–december 1, 1791)
14 may – 2 august 2011 (not 14 may–2 august 2011)
1–17 september;   february–october 2009;   1492 – 7 april 1556
christmas day – new year s eve;   christmas 2001 – easter 2002;   10:30 pm tuesday – 1:25 wednesday;   6:00 p.m. – 9:30 p.m. (but 6:00–9:30 p.m.)
wavelengths in range 28 mm – 17 m.