Weekday names are abbreviated with single, two or three digit letters or written with the full form and month names are abbreviated with three letters or written with a full form (Weekday abbreviated names: Sun, Mon, Tue, Wed, Thu, Fri, Sat—Months: Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec). Calendars mostly show Sunday as the first day of the week. Some other calendars and most other weeks (schedules, planners, etc.) instead treat Monday as the first day of the week. The Philippines uses the 12-hour notation in most oral or written communication, whether formal or informal. A colon (:) is used to separate the hour from the minutes (12:30 p.m.). The use of the 24-hour notation is usually restricted in use among airports, the military, police and other technical purposes. Numerical elements of dates and the time may pronounced using either their Spanish names or vernacular ones; the former is somewhat pedestrian whilst the latter tends to be longer, formal and academic. Examples:  Date: 6/3/2019  Time: 8:30 p.m.