Times and dates

• Use figures for time, except noon and midnight:

  9:30 a.m. – noon or midnight – 6 a.m.

• Abbreviate time of day with lower case letters separated by periods:

  a.m./p.m.

• Times on the hour should not use zeroes:

  9 – 10 a.m.

• Time not on the hour should use a colon to separate hours from minutes:

  9:30 a.m.

• Do not put a 12 in front of noon:

  Noon, not 12 noon.

• Avoid the redundant:

  11 p.m. tonight.

• When the day follows the month, express it in cardinal figures:

  On May 11.

• When the day precedes the month or stands alone, express it in ordinal figures or ordinal numbers:

  I arrive on the fifth of May and leave on the twenty-first.

• Abbreviate the month (except March, April, May, June and July) when it appears with the date, but not when it appears alone or with the year:

  I was born on Sept. 15, 1983. I was born in September 1983. I was born in September.