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For a range of time or date, either use an unspaced en dash to separate the times items or use both “from” and “to.” Don't combine the en dash with “from” or use “to” without “from.”

from 7:30 a.m. to 10:30 p.m.

from 7:30 a.m.–10:30 p.m. 

from May 1 to June 30May 1–June 30 7:30 a.m. to 10:30 p.m.

7:30 a.m.–10:30 p.m.

If both times are in the morning or in the evening, don’t repeat the “a.m.” or “p.m.”

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June 10–June 15

June 10–15

 

1996–1999

1996–99

Ordinals

The letters in ordinal numbers should not appear as superscripts.

Cornell celebrated the 150th anniversary of its founding in 2015.