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CalendarType

is an option that determines the calendar system in which all dates are to be interpreted and output.

Details
Details and Options Details and Options
Examples  
Basic Examples  
Scope  
Properties & Relations  
See Also
Related Guides
History
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CalendarType

CalendarType

is an option that determines the calendar system in which all dates are to be interpreted and output.

Details

  • CalendarType is set to "Gregorian" by default.
  • Date calendars can be given as named objects, like "Gregorian" or "Julian", or in the form {"name",<|param1val1,param2value2,…|>} for calendars with nondefault parameter values.
  • Calendar parameters include:
  • "YearZero"whether the calendar includes a year zero
    "StartOfDay"beginning instant of the day
    "Location"reference geodetic position for astronomical calendars
  • Default calendar parameters can be obtained using CalendarData["name"].
  • Prominent arithmetic calendars include:
  • "Gregorian"proleptic Gregorian calendar
    "Islamic"tabular Islamic calendar
    "Jewish"arithmetic lunisolar Hebrew calendar
    "Julian"proleptic Julian calendar
  • Additional arithmetic calendars are given by CalendarData["ArithmeticCalendar"]. Astronomical calendars are given by CalendarData["AstronomicalCalendar"].

Examples

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Basic Examples  (5)

Get the current date on the Jewish calendar:

Represent a Julian calendar date:

Get the next month on the Chinese lunar calendar:

Represent the month of Ramadan on the Islamic calendar:

Parameterized calendars can be used to adjust the values for "StartOfDay" or "YearZero" handling:

Compute a date range returning dates in the Islamic calendar:

Scope  (1)

Use CalendarType to specify time stamps in an EventSeries or in a TimeSeries:

The dates in the above event series are now given in the default calendar type:

Create a time series specifying the start date according to the Islamic calendar:

Properties & Relations  (2)

The list of available calendar types can be found using CalendarData:

This includes both arithmetic and astronomical calendar types:

The default calendar type in DateObject is "Gregorian":

Change the output for the same dates to the "Jewish" calendar:

Change the calendar of the input dates as well:

The date range now represents a different period in time:

Wolfram Research (2012), CalendarType, Wolfram Language function, https://reference.wolfram.com/language/ref/CalendarType.html (updated 2020).

Text

Wolfram Research (2012), CalendarType, Wolfram Language function, https://reference.wolfram.com/language/ref/CalendarType.html (updated 2020).

CMS

Wolfram Language. 2012. "CalendarType." Wolfram Language & System Documentation Center. Wolfram Research. Last Modified 2020. https://reference.wolfram.com/language/ref/CalendarType.html.

APA

Wolfram Language. (2012). CalendarType. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/CalendarType.html

BibTeX

@misc{reference.wolfram_2025_calendartype, author="Wolfram Research", title="{CalendarType}", year="2020", howpublished="\url{https://reference.wolfram.com/language/ref/CalendarType.html}", note=[Accessed: 15-August-2025]}

BibLaTeX

@online{reference.wolfram_2025_calendartype, organization={Wolfram Research}, title={CalendarType}, year={2020}, url={https://reference.wolfram.com/language/ref/CalendarType.html}, note=[Accessed: 15-August-2025]}