Subject Index - Dates
Spell out "fiscal year" (e.g., Fiscal Year 2006) the first time you use it; after that, you can abbreviate it using two capitals followed by a space before the full year (e.g., FY 2001). FY01 may be used to save space in charts and graphs. On the Web, always spell out fiscal year.
Capitalize the months in all uses. When a month is used with a specific date, abbreviate only Jan., Feb., Aug., Sept., Oct., Nov., and Dec. (Jan. 9, 2008). Also abbreviate these months in tables; however, omit the period. Spell out months when used alone or just with the year, and omit commas when the month and year appear together (October 2001).
Use a lowercase s (no apostrophe) to show the plural of a decade expressed with numerals (e.g., the 1990s).