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This purpose of the '''{{tl|start date}}''' template is to return the date (or date-time) that an event or entity started or was created, and to do so in a standard format. It also includes duplicate, machine-readable date (or date-time) in the ISO date format (which is hidden by CSS), for use inside other templates (or table rows) which emit [[microformat]]s. '''It should be used only once in each such template''' and '''never used outside such templates'''. The hidden date degrades gracefully when CSS is not available.

== When not to use this template ==
Do not use this template for:
* dates that are uncertain e.g., "before 4 April 1933"; "around 18 November 1939".
* dates outside the range given under "[[#Limitation|Limitation]]", below.
* other, secondary dates
* outside [[microformat]]-emitting templates - if in doubt, see the parent template's documentation
* more than one date in any parent template

== Syntax ==
* {{tlx|start date|year|month|day}}
* {{tlx|start date|year|month|day|HH|MM|SS|TimeZone}} (MM and SS are optional; TimeZone may be a numerical value, or "Z" for [[Coordinated Universal Time|UTC]]; see examples)

; Examples
* {{tlx|start date|1993}} → "{{start date|1993}}"
* {{tlx|start date|1993|02}} → "{{start date|1993|02}}"
* {{tlx|start date|1993|02|24}} → "{{start date|1993|02|24}}"
* {{tlx|start date|1993|02|24|08|30}} → "{{start date|1993|02|24|08|30}}"
* {{tlx|start date|1993|02|24|08<nowiki>|||+01:00</nowiki>}} → "{{start date|1993|02|24|08|||+01:00}}"
* {{tlx|start date|1993|02|24|08<nowiki>|||-07:00</nowiki>}} → "{{start date|1993|02|24|08|||-07:00}}"
* {{tlx|start date|1993|02|24|08|30|23}} → "{{start date|1993|02|24|08|30|23}}"
* {{tlx|start date|1993|02|24|08|30|23|Z}} → "{{start date|1993|02|24|08|30|23|Z}}"
* {{tlx|start date|1993|02|24|08|30|23|+01:00}} → "{{start date|1993|02|24|08|30|23|+01:00}}"
* {{tlx|start date|1993|02|24|08|30|23|-07:00}} → "{{start date|1993|02|24|08|30|23|-07:00}}"

An optional parameter, <code>df</code>, can be set to "y" or "yes" (or indeed any value) to display the day before the month. This is primarily used in articles using DMY format for dates.

; Examples
* {{tlx|start date|<nowiki>1993|02|24|df=y</nowiki>}} → "{{start date|1993|02|24|df=y}}"
* {{tlx|start date|<nowiki>1993|02|24|08|30|df=yes</nowiki>}} → "{{start date|1993|02|24|08|30|df=yes}}"

== TemplateData ==
{{TemplateDataHeader}}
<templatedata>
{
"description": "Date that an event or entity started or was created",
"params": {
"1": {
"label": "YYYY",
"description": "start year",
"type": "number"
},
"2": {
"label": "MM",
"description": "start month",
"inherits": "1"
},
"3": {
"label": "DD",
"description": "start day of month",
"inherits": "1"
},
"4": {
"label": "HH",
"description": "start hours",
"inherits": "1"
},
"5": {
"label": "MM",
"description": "start minutes",
"inherits": "1",
"default": "0"
},
"6": {
"label": "SS",
"description": "start seconds",
"inherits": "5"
},
"7": {
"label": "TZ",
"description": "time zone offset, “+02:00”, “-06:00” or “Z” for UTC",
"inherits": "1",
"type": "string/line"
},
"df": {
"label": "day first",
"description": "boolean parameter to put the date before the month name",
"default": "false",
"type": "string/line"
},
"mf": {
"label": "month first",
"description": "mf=yes: order mm-dd-yyyy (=the default order)",
"type": "string",
"default": "yes",
"deprecated": "trivial because default. Or use df=yes (for mf=no)."
}
}
}
</templatedata>

== Use in microformats ==
{{UF-date-part}}

=== Example ===
{{nowiki template demo|format=inline|output=nowiki+|code=<nowiki>{{Start date|2016|12|31}}</nowiki>}}

== See also ==
* {{tlg|start-date}}, an alternative to this template.
* {{tlg|film date}}, a similar template for use with {{tl|Infobox film}}.
* {{tlg|start date and age}}
* {{tlg|start date and years ago}}
* {{tlg|Start and end dates}}
* {{tlg|end date}}
* {{tlg|end-date}}
* {{tlg|trim date}}
* [[Wikipedia:WikiProject Microformats|WikiProject Microformats]]

{{Birth, death and age templates|dates}}

<includeonly>{{#ifeq:{{SUBPAGENAME}}|sandbox |
| 
[[Category:Date mathematics templates]]
[[Category:Templates generating hAtom]]
[[Category:Templates generating hCalendars]]
[[Category:Templates generating hCards]]
}}</includeonly>

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