Write specific dates within the body of a text as follows, abbreviating the month.
Do not change the order of construction, e.g. do not use "Saturday, 19 Sept."
NOTE: The months of March, April, May, June and July are never abbreviated.
When writing approximate dates within the body of a text, spell out the month in full.
Avoid commas when you are referring to a specific month within a specific year.
When writing about decades, use numbers, and no apostrophe:
When a decade is used as an adjective:
When writing about periods of time over years, write the numbers out in full using a hyphen not a slash.
When writing about centuries, as with numbers spell out the first nine as words, and use digits for 10 and above.
Hours are written numerically with no zeros. Use periods with a.m. and p.m. with a space following the number
A range of times is written using a hyphen.
NOTE: The above rules for dates and times apply within the body of text. In calendars, tables, forms or graphs where space is extremely tight, short forms and figures can be used.