En Dash vs. Em Dash. En Dash. An en dash , just one dash when typed, is used for periods of time when you might otherwise use to You never put a space before or after the dash Examples: The years 2001–2003 January–June. En Dash.
An em dash is the width of two dashes when typed.
Do not use a space before or after the dash
Use an em dash sparingly in formal writing.