Web Style Guide & Best Practices"D" Topics
Dates & Years
Full dates with a year should use the abbreviated written month. Dates without a year should use the full written month. Do not include an ordinal with the number.
Correct
Dec. 13, 2010 or December 13
Incorrect
December 13th
In prose, year ranges in the same decade may omit the first two digits in the second year. In headings or year ranges spanning two different decades must use all four digits for both years. When using multiple date ranges in a paragraph, be consistent, defaulting to using all four digits for both years if there could be a mixture.
Correct
1977-79
1977-2011
1973-1977 and 1977-2011
Incorrect
1997-01
1973-77 and 1977-2011