From 1 to 10, numbers should be written out: one, two, three, etc...
Above 10, numbers should be written numerically: 11, 12, 13, etc...
If there are too many numbers in a line, write numbers numerically
Use numerals when exact times are emphasized: 9:30 a.m.
Use lowercase a.m. (ante meridiem) and p.m. (post meridiem)
Spell out words/phrases that do not include actual numbers: half past, quarter of, midnight, noon
Dates should be written as numbers instead eg. 1987
Decades should be written like this: '60s