AP Style a.m., p.m.

AP Style time of day holds that the time descriptors “ante meridiem” (before noon) and “post meridiem” (after noon) should be abbreviated with lowercase letters and with periods (a.m. and p.m.). AP warns against redundancies in your writing such as“10 a.m. this morning.” For instance,

  • Wrong: We have breakfast planned for 10 a.m. Monday morning.
  • Correct: We have breakfast planned for 10 a.m. Monday.
  • Correct: We have breakfast planned for Monday at 10 a.m.

Unlike Chicago Style, AP Style time of day does not require zeros after even hours.

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