calendar
US /ˈkæl.ən.dɚ/
UK /ˈkæl.ən.dɚ/

1.
Kalender
a chart or series of pages showing the days, weeks, and months of a particular year, or giving particular seasonal information
:
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I marked the appointment on my calendar.
Ich habe den Termin in meinem Kalender markiert.
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The new year's calendar has beautiful landscapes.
Der Kalender des neuen Jahres hat wunderschöne Landschaften.
2.
Kalendersystem, Zeitrechnung
a system by which the beginning, length, and divisions of the year are fixed
:
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The Gregorian calendar is widely used around the world.
Der gregorianische Kalender ist weltweit weit verbreitet.
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Ancient civilizations developed their own unique calendars.
Alte Zivilisationen entwickelten ihre eigenen einzigartigen Kalender.