Full syntax
{{Start date and age|yyyy|mm|dd|df=yes|br=yes}}
Common usage
{{Start date and age|yyyy|mm|dd}} to display result in March 4, 2010; 4 months ago format
{{Start date and age|yyyy|mm|dd|df=yes}} to display result in 4 March 2010; 4 months ago format
Description of parameters
Parameter Description
yyyy Four digits indicating the year. The year must always appear in a 4-digits form.
mm A number between 1 to 12, indicating the month. Leading zeros in the number are ignored.
dd A number between 1 to 31, indicating the day of the month. Leading zeros in the number are ignored.
df= The optional parameter df can either be set to yes or anything other than yes. When set to yes, date will be displayed in DMY format: 4 March 2010. When set something other than yes or when this parameter is not included, date will be displayed in MD,Y format: March 4, 2010.

As for choosing the right format to use, consult Manual of Style (dates and numbers): Full date formatting.

br= The optional parameter br can either be set to yes or anything other than yes. When set to yes, a line break will be inserted between the date and the age. When set something other than yes or when this parameter is not included, a breaking space will be inserted between the date and the age. In either case, a semicolon separates the date and age, immediately before the line break or space.
Syntax Result
Full date (year, month, day)
{{Start date and age|2010|01|02}} ২ জানুৱাৰী ২০১০; ১৪ বছৰ আগত (2010-01-02)
{{Start date and age|2008|08|09}} ৯ আগষ্ট ২০০৮; ১৬ বছৰ আগত (2008-08-09)
{{Start date and age|2003|07|05}} ৫ জুলাই ২০০৩; ২১ বছৰ আগত (2003-07-05)
{{Start date and age|2010|1|2|df=yes}} ২ জানুৱাৰী ২০১০; ১৪ বছৰ আগত (2010-01-02)
{{Start date and age|2008|8|9|df=yes}} ৯ আগষ্ট ২০০৮; ১৬ বছৰ আগত (2008-08-09)
{{Start date and age|2003|7|5|df=yes}} ৫ জুলাই ২০০৩; ২১ বছৰ আগত (2003-07-05)
{{Start date and age|2009|9|9|br=yes}} ৯ ছেপ্টেম্বৰ ২০০৯;
১৫ বছৰ আগত
 (2009-09-09)
Today:
{{Start date and age|2024|11|3}}
৩ নৱেম্বৰ ২০২৪; ০ দিন আগত (2024-11-03)
Yesterday:
{{Start date and age|2024|11|2}}
২ নৱেম্বৰ ২০২৪; ১ দিন আগত (2024-11-02)
Year and month
{{Start date and age|2002|03}} মাৰ্চ ২০০২; ২২ বছৰ  আগতে (2002-03)
{{Start date and age|2002|04}} এপ্ৰিল ২০০২; ২২ বছৰ  আগতে (2002-04)
Year only
{{Start date and age|2002}} ২০০২; ২২ বছৰ  আগতে (2002)

This template also returns the date, hidden by CSS, in the ISO 8601 format needed by one or more of the following microformats:

usually, but not always, within infobox or similar templates, or tables.

Its use in hCard is for organizations, venues and similar; use {{Birth date}} or {{Birth date and age}} for people.

Similarly, {{End date}} returns the date as hCalendar's (class="dtend").

See the microformats project for further details.

This template has no provision to deal with a date in a non-Gregorian calendar. Also, ISO 8601 requires mutual agreement among those exchanging information before using years outside the range 1583–9999 CE. Therefore, use of this template for non-Gregorian dates or dates outside that range constitutes a false claim of conformance to the ISO 8601 standard.

Any editor encountering such usage should change the date to plain text with no template; or if not confident in doing so, raise the matter on this template's talk page.