DAYNAME

Dayname, sometimes written as dayname or day name, refers to the name assigned to the day of the week for a specific date. The day names are the labels such as Monday, Tuesday, and so on, and they can be shown in full (long form) or in abbreviated forms like Mon or Tue. Day names vary by locale and language, reflecting cultural conventions for naming weekdays and, in some regions, the order of the week.

In daily use, day names appear in calendars, schedules, and planning tools to identify when events occur. Software often localizes day names to the user’s language and may adapt formats for different locales, such as using different abbreviations or starting the week on a specific day.

In computing, day names are derived from date values. Many programming languages offer built-in ways to obtain or format a day name from a date object. Examples include:

- Python: calendar.day_name or date.strftime('%A') to get the full day name.

- JavaScript: new Date().toLocaleDateString(undefined, { weekday: 'long' }) for the full name; 'short' for an abbreviation.

- PHP: date('l', timestamp) yields the full day name; date('D') yields an abbreviated form.

- Java: java.time.DayOfWeek or DateTimeFormatter to render the name.

- SQL: MySQL DAYNAME(date); SQLite strftime('%A', date); PostgreSQL to_char(date, 'FMDay') for locale-aware results.

Dayname serves as a basic, locale-sensitive label for days of the week in both human-readable and programmatic contexts.