Calendars are also used as part of a complete timekeeping system: date and time of day together specify a moment in time. In the modern world, timekeepers can show time, date, and weekday. Some may also show the lunar phase.
Calendars are also used as part of a complete timekeeping system date and time of day together specify a moment in time In the modern world timekeepers can show time date and weekday Some may also show the lunar phase