Template:Which calendar

[which calendar?]

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The {{Which calendar}} template is a variant of {{Clarify}} to be used specifically when the clarification that is needed is the calendar in which a particular date is expressed.

At various times in modern history, multiple calendars were in use at the same time. Therefore, in an article on Russian history, a date such as "March 1, 1881" may be ambiguous: it might mean March 1 [O.S. March 13] 1881, or it might mean February 17 [O.S. March 1] 1881.

You may use either of the following formats:

{{which calendar|{{subst:DATE}}}}


{{which calendar|date=November 2021}}

This template will place articles into Category:Articles containing ambiguous dates.

To fix the issue, use the {{OldStyleDate}} template to clarify the meaning of the date:

{{OldStyleDate|March 1|1881|March 13}}

which produces

March 1 [O.S. March 13] 1881


This is the TemplateData for this template used by TemplateWizard, VisualEditor and other tools. Click here to see a monthly parameter usage report for this template based on this TemplateData.

TemplateData for Which calendar

For tagging ambiguous dates which might plausibly be interpreted differently according to multiple calendars in use at the time.

Template parameters

This template prefers inline formatting of parameters.

Link targetlink

Change what "which calendar?" text links to

Page nameoptional
Month and yeardate

Month and year of tagging; e.g., 'January 2013', but not 'jan13'

Auto value


See alsoEdit