Until 1913, the official time standard for the whole of China was still the apparent solar time of Beijing, the capital of the country at the time. Starting in 1914, the Republic of China government began adopting the Beijing Local Mean Solar Time as the official time standard.
(titles) (of a man): Mr (Mister, mister), Sir (sir); (of a woman): Ms (Miz, mizz), Mrs (Mistress, mistress), Miss (miss), Dame (dame), (of a non-binary person): Mixter: Mx; (see also): Dr (Doctor, doctor), Madam (madam, ma'am)
When an abbreviation can be used to refer to a singular thing  a run batted in, a meal ready-to-eat, a prisoner of war  it's surely a good idea to form the plural by adding s to the abbreviation: RBIs, MREs, POWs. (Notice that no apostrophe is involved in the formation of these plurals.