See CMoS 6.78–80 | See also Hyphens
We do not use the em dash. Instead, we use an en dash with a space on either side.
Try to visit in the early morning – the sunrise is spectacular.
Use an en dash in place of a hyphen in a phrasal adjective containing a proper noun of two or more words.
post–Civil War period; Monty Python–style comedy; BUT anti-Mafia campaign; Rome-style pizza
Use an en dash rather than hyphens to prevent ambiguity with open or hyphenated compounds.
a nursing home–home care policy
Although the use of the en dash is technically correct, in the following examples a hyphen is fine as there is no chance of misreading:
country-music-influenced song (not country music–influenced)
picture-postcard-perfect scene (not picture postcard–perfect)
Use the en dash to connect continuing or inclusive numbers, dates or time.
1982–89; 129–133 Spring St; 29–31 January; May–July
Use the en dash alone to indicate a concluding date in the indeterminate future other than when indicating a person’s life – for life spans that are ongoing use eg (b 1973).
Queen Elizabeth II (r 1953–)
Use en dashes to link places when listing transport routes.
Melbourne–Singapore–Delhi flight; north–south road
En dashes are also used when mentioning borders.
the US–Canada border