Template:Calendar date

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{{Calendar date}} aka {{Moveable date}} is for displaying the calendar date of holidays or events that move annually, that do not have a fixed day and month of occurrence.

Examples include the Jewish new year Hanukkah which is based on a non-Gregorian calendar system. The June solstice wobbles celestially.

Usage

The template requires only two arguments, the holiday/event name (|holiday= or |event= are synonymous) and the year |year= in the Gregorian calendar.

Example:

{{calendar date |holiday=Rosh Hashanah |year=2019}}

Produces:

Sunset, 29 September 2019 – nightfall, 1 October 2019

Optionally try |format=infobox in an infobox

Example:

{{Calendar date |holiday=Rosh Hashanah |year=2019 |format=infobox}}

Produces:

Sunset, 29 September –
nightfall, 1 October

Options

Required

holiday or event

Name of an available holiday. Ex. |holiday=Rosh Hashanah or |event=Rosh Hashanah

year

Year of event. Ex. |year=2019

Options

df

Date Format options can be "dmy", "mdy" or "iso" (|df=dmy). Defaults are set in Module:Calendar date/events

format

Use |format=infobox in an infobox

cite

If set to anything (|cite=) a citation is added.

Adding or editing holidays

Holidays are configured in Module:Calendar date/events which has additional documentation and examples.

There are two holiday types: "calculator" and "localfile".

calculator - Moveable dates are determined with a calculator plugin. For example Rosh Hashanah uses the {{Hebrew year}} calculator:

datatype = "calculator"

datasource = "{{#time:Y-m-d|@{{Hebrew year/rhdatum|{{#timel:xjY|YYYY-11-1}}}}-1 days}}"

When the template runs, it replaces "YYYY" with the value of the |year= argument, then executes the datasource code. Calculators can be any available on Wikipedia, so long as it accepts a year value and returns a date in ISO format. All calculators are third-party plugins, the template does not do calculations.

localfile - When a calculator is not possible or unavailable, moveable dates can be stored in local files. For example with Tu BiShvat:

datatype = "localfile"

datasource = "Module:Calendar date/localfiles/Tu BiShvat"

The file Module:Calendar date/localfiles/Tu BiShvat contains a static list of dates.

wikidata - <to be developed - see talk page for more info>

Holidays with multiple aliases

If a holiday has multiple aliases, and it's desired the template support them with the |holiday= argument, create multiple entries in Module:Calendar date/events one for each name.

Dynamic dates

The |year= can accept templates.

For example, to show the current year for Tu BiShvat use {{CURRENTYEAR}}:

{{Moveable date |holiday=Tu BiShvat |year={{CURRENTYEAR}}}}

Produces

Sunset, 24 January 2024 – nightfall, 25 January 2024

Other useful templates are {{LASTYEAR}} and {{NEXTYEAR}}.

Combined they can be used in infoboxes to fully automate updates, example from the Hanukkah infobox:

|date{{LASTYEAR}} = {{Moveable date |holiday=Hanukkah |year={{LASTYEAR}} |format=infobox |cite=}}

|date{{CURRENTYEAR}} = {{Moveable date |holiday=Hanukkah |year={{CURRENTYEAR}} |format=infobox}}

|date{{NEXTYEAR}} = {{Moveable date |holiday=Hanukkah |year={{NEXTYEAR}} |format=infobox}}

|date{{NEXTYEAR|2}} = {{Moveable date |holiday=Hanukkah |year={{NEXTYEAR|2}} |format=infobox}}

Offset date

An offset date can be calculated for a given moveable date using #time parser function.

For example, to show the date of the Friday following Ascension Thursday:

{{Moveable date |holiday=Ascension Thursday |df=dM |year={{CURRENTYEAR}}}}

{{#time: d M Y| {{Moveable date |holiday=Ascension Thursday |df=d |year={{CURRENTYEAR}}}} + 1 day}}

Produces

9 May 2024

10 May 2024

Tracking categories

• Category:Calendar date template errors

VisualEditor TemplateData

What is this? See https://www.mediawiki.org/wiki/Help:TemplateData

A template for displaying moving calendar dates

Template parameters[Edit template data]

Parameter		Description	Type	Status
Name of holiday/event	holiday	The name of the holiday or event Example Rosh Hashana	String	required
Holiday year	year	The year to display the holiday dates for Example 2019	String	required
Display format option	format	Options for controlling display output such as for an infobox Default none Example infobox	String	optional
Date Format	df	Date format to use when displaying dates Default dmy Example mdy	String	optional

External links

• Simple holidays by Mark Seemann

The above documentation is transcluded from Template:Calendar date/doc. (edit | history)
Editors can experiment in this template's sandbox (edit | diff) and testcases (edit) pages.
Add categories to the /doc subpage. Subpages of this template.