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Timestamps may be specified in several formats, see [[mw:Special:MyLanguage/Timestamp|the Timestamp library input formats documented on mediawiki.org]] for details. ISO 8601 date and time is recommended: <kbd><var>2001</var>-<var>01</var>-<var>15</var>T<var>14</var>:<var>56</var>:<var>00</var>Z</kbd>. Additionally, the string <kbd>now</kbd> may be used to specify the current timestamp.

Input to MediaWiki should be NFC-normalized UTF-8. MediaWiki may attempt to convert other input, but this may cause some operations (such as [[Special:ApiHelp/edit|edits]] with MD5 checks) to fail.

Parameters that take multiple values are normally submitted with the values separated using the pipe character, e.g. <kbd>param=value1|value2</kbd> or <kbd>param=value1%7Cvalue2</kbd>. If a value must contain the pipe character, use U+001F (Unit Separator) as the separator ''and'' prefix the value with U+001F, e.g. <kbd>param=%1Fvalue1%1Fvalue2</kbd>.

Some parameter types in API requests need further explanation:

Modules to display help for (values of the <var>action</var> and <var>format</var> parameters, or <kbd>main</kbd>). Can specify submodules with a <kbd>+</kbd>.

The <var>revids</var> parameter may not be used with the list options (<var>$1limit</var>, <var>$1startid</var>, <var>$1endid</var>, <kbd>$1dir=newer</kbd>, <var>$1user</var>, <var>$1excludeuser</var>, <var>$1start</var>, and <var>$1end</var>).

You must specify a valid timestamp for the <var>sortkey</var> parameter. It should be in the form YYYYMMddhhmmss, a unix timestamp or <kbd>now</kbd>.

The <var>section</var> parameter must be a valid section ID or <kbd>new</kbd>.

<kbd>section=new</kbd> cannot be combined with the <var>oldid</var>, <var>pageid</var> or <var>page</var> parameters. Please use <var>title</var> and <var>text</var>.

List of module names (values of the <var>action</var> and <var>format</var> parameters, or <kbd>main</kbd>). Can specify submodules with a <kbd>+</kbd>, or all submodules with <kbd>+*</kbd>, or all submodules recursively with <kbd>+**</kbd>.

The <kbd>name</kbd> sort option cannot be used together with <var>$1changedsince</var>.

Only parse the content of the section with this identifier.

When <kbd>new</kbd>, parse <var>$1text</var> and <var>$1sectiontitle</var> as if adding a new section to the page.

<kbd>new</kbd> is allowed only when specifying <var>text</var>.

Invalid value for <var>$1urlparam</var> (<kbd>$2=$3</kbd>).

Property to sort by. <kbd>name</kbd> cannot be used together with <var>$1changedsince</var>. Defaults to <kbd>updated</kbd> when <var>$1changedsince</var> is set, and to <kbd>name</kbd> otherwise.

The <kbd>$1</kbd> parameter may only be used with <kbd>$2</kbd>.

<var>titles</var>, <var>pageids</var> or a generator was used to supply multiple pages, but the <var>$1limit</var>, <var>$1startid</var>, <var>$1endid</var>, <kbd>$1dir=newer</kbd>, <var>$1user</var>, <var>$1excludeuser</var>, <var>$1start</var>, and <var>$1end</var> parameters may only be used on a single page.

List of query module names (value of <var>prop</var>, <var>meta</var> or <var>list</var> parameter). Use <kbd>$1modules=query+foo</kbd> instead of <kbd>$1querymodules=foo</kbd>.

Parameter <var>$1text-main</var> is required when <var>$1slots</var> contains <kbd>main</kbd> (cannot delete the main slot).

The value for the preference specified by <var>optionname</var>.

The value for the override specified by <var>optionname</var>.

The value for the option specified by <var>$1optionname</var>.

Options for the CategoryTree constructor as a JSON object. The <var>depth</var> option defaults to <kbd>1</kbd>.

Sort direction: <kbd>ascending</kbd> (A to Z, oldest to newest) or <kbd>descending</kbd>. Ignored when <var>$1project</var> and <var>$1title</var> is set.

The parameter <var>$1</var> may not be empty.

Ignoring value <kbd>$2</kbd> in <var>$1</var> when processing templated parameters.

Specify <kbd>$1user=#<var>ID</var></kbd> instead.

Specify <kbd>$1user=#<var>ID</var></kbd> instead.