[(#REM) TimeCircles
	short <model> available sitewide ('class' is optional)
		<datecountdown|data-date=2019-01-01 00:00:00|class=my-css-selector>
	Short <model> available if plugin 'agenda' is installed & active
	- using sitewide as <datecountdown|id_evenement=XYZ>
	- using directly in any SPIP event context &/or loop as
		<datecountdown|> or in template as #MODELE{datecountdown}{...}
]<BOUCLE_datecountdown(EVENEMENTS){id_evenement}>
	[(#SET{date_time_cd,[(#DATE_DEBUT|affdate{'Y-m-d H:i:s'})]})]</BOUCLE_datecountdown>
</B_datecountdown>
[(#SET{date_time_cd,#ENV{data-date}})]
<//B_datecountdown>
<div class="DateCountdown[ (#ENV{class})]" data-date="[(#GET{date_time_cd})]" style="width: 100%;"></div>