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The guidelines below show how to write spans of time in different formats.
Use an en dash (a short dash) to link two figures that represent a continuous sequence of time. Do not put a space on either side of the en dash.
Do not use the en dash if the sequence is introduced by the preposition from or between. From should be paired with to, while between should be paired with and.
In informal writing, the first a.m. or p.m. is sometimes omitted when the span of time occurs in the same portion of the day (morning or afternoon). However, in formal writing, you need to repeat the abbreviation.
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