time

• Use a.m. and p.m., and don’t include minutes if it is on the hour. 12 p.m.; 12:15 p.m.; 12:30-1 p.m.; 11:30 a.m.-1:30 p.m. 
• Include a time zone in event listings. 12 p.m. ET; 12 p.m. Eastern time; noon EST. See also time zones
• Spell out numbers less than 10: Five-minute warning. Eight-hour day. Two hours left.