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21.12 dates 1. Write centuries with Arabic numerals not Latin numerals. Note nonreligious alternatives to BC (before Christ) and AD (anno domini – year of our Lord) are BCE (before common era) and CE (common era, and also BPE (before present era) and PE (present era. However these acronyms are not, as yet, very common.
2. Write decades in their full numerical forms) rather than abbreviated forms) as otherwise there could be confusion between centuries.
Also use the plural s without an apostrophe.
3. Write the first decade of each century in words not numerals. Note that s could refer to the period from 2000-2009, or 2000-2099.
4. The world has three principal systems for writing dates:
Form A (dmy) 10 March 2020 = 10.03.2020. Form B (mdy) March 10, 2020 = 03.10.2020. Form C (ymd) 2020 March 10 = 2020-10-03. The first form (number month year) is perhaps the clearest. To avoid confusion, always write the date with the month as a word.
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