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12 a.m. denotes midnight, and 12 p.m. denotes noon, but there is sufficient confusion over the meanings of a.m. and p.m. when the hour is 12 to make it advisable to use 12 noon and 12 midnight where clarity is required. am stands for anti-merridian which means before midday i.e. morning pm stands for post merridian which means after midday i.e. afternoon

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