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For a range of time or date, either use an unspaced en dash to separate the times or use both “from” and “to.” Don't combine the en dash with "from" or have a "to" without a "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 30

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

7:30 a.m.–10:30 p.m.May 1–June 30

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

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