Template:Is year/doc

This is a documentation subpage for Template:Is year.
It contains usage information, categories and other content that is not part of the original template page.

Usage

This template can be used in other templates to check or analyse a year, whether Common Era (CE) or Before Common Era (BCE).

{{is year|input=|function=}}

The template can be used without named parameters as well. The most basic usage is:

{{is year|}}

Input

The input must be in the form of YYYY or YYYY BCE. The maximum value is 2100 and the minimum value is 2000 BCE. As there is no year 0 (zero), the input 0 is inappropriate.

Function

The function must be one of the numbers in this table. This parameter is optional. If not set, function 0 is the default.

Number	Function	Output
0	Basic	Returns the numeric part of the input only.
1	Decade	Returns the decade corresponding to this year.
2	Century	Returns the century corresponding to this year.
3	Logic	Returns a 1 (one) if the input is a recognised year.
4	Common Era	Returns 1 (one) for years in the Common Era/Anno Domini. Returns -1 (minus one) for years Before Common Era.

If the input is not a recognised year, this template will return FALSE; unless function 3 or function 4 is selected, in which case it will return 0 (zero).

Examples

Basic

{{is year|50 BCE}}

50

{{is year|input=50 BCE}}

50

{{is year|input=50 BCE|function=0}}

50

{{is year|1930}}

1930

Decade

{{is year|input=1930|function=1}}

1930s

{{is year|input=75|function=1}}

70s

{{is year|input=75 BCE|function=1}}

70s BCE

{{is year|input=1930 BCE|function=1}}

1930s BCE

Century

{{is year|input=2000|function=2}}

20th century

{{is year|input=1930|function=2}}

20th century

{{is year|input=75|function=2}}

1st century

{{is year|input=75 BCE|function=2}}

1st century BCE

{{is year|input=1930 BCE|function=2}}

20th century BCE

Logic

{{is year|input=1930|function=3}}

1

{{is year|input=1930s|function=3}}

0

Note that an "s" has been added to this input. This is a decade and not a year.

{{is year|input=Foo|function=3}}

0

Common Era

{{is year|input=1930|function=4}}

1

{{is year|input=0|function=4}}

0

{{is year|input=1930 BCE|function=4}}

-1

Unrecognised input

{{is year|input=Foo}}

FALSE

{{is year|input=Foo|function=3}}

0

{{is year|input=Foo|function=4}}

0

Notes

An alternative form of using function 3 (logic) is to combine this template with {{is number}}.

{{is number|{{is year|1930}}}}

1

{{is number|{{is year|Foo}}}}