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Question is pretty self-explanatory. Either way, a date on a calendar is a date. When it becomes unexpected, it sounds right to me to say an unexpected date instead of a unexpected date. Same for when using expected.

Which one is it?

tchrist
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pnizzle
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1 Answers1

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"a" is used when the next word begins with a consonant sound

"an" is used when the next word begins with a vowel sound

Therefore it is "an expected completion date" (also I would pronounce the "an" more nasally so it is not confused with unexpected)

katatahito
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