HTMLTimeElement: dateTime property

The HTMLTimeElement.dateTime property is a string that reflects the datetime HTML attribute, containing a machine-readable form of the element's date and time value.

The format of the string must follow one of the following HTML microsyntaxes:

Microsyntax	Description	Examples
Valid month string	YYYY-MM	2011-11, 2013-05
Valid date string	YYYY-MM-DD	1887-12-01
Valid yearless date string	MM-DD	11-12
Valid time string	HH:MM HH:MM:SS HH:MM:SS.mmm	23:59 12:15:47 12:15:52.998
Valid local date and time string	YYYY-MM-DD HH:MM YYYY-MM-DD HH:MM:SS YYYY-MM-DD HH:MM:SS.mmm YYYY-MM-DDTHH:MM YYYY-MM-DDTHH:MM:SS YYYY-MM-DDTHH:MM:SS.mmm	2013-12-25 11:12 1972-07-25 13:43:07 1941-03-15 07:06:23.678 2013-12-25T11:12 1972-07-25T13:43:07 1941-03-15T07:06:23.678
Valid time-zone offset string	Z +HHMM +HH:MM -HHMM -HH:MM	Z +0200 +04:30 -0300 -08:00
Valid global date and time string	Any combination of a valid local date and time string followed by a valid time-zone offset string	2013-12-25 11:12+0200 1972-07-25 13:43:07+04:30 1941-03-15 07:06:23.678Z 2013-12-25T11:12-08:00
Valid week string	YYYY-WWW	2013-W46
Four or more ASCII digits	YYYY	2013, 0001
Valid duration string	PdDThHmMsS PdDThHmMs.XS PdDThHmMs.XXS PdDThHmMs.XXXS PThHmMsS PThHmMs.XS PThHmMs.XXS PThHmMs.XXXS ww dd hh mm ss	P12DT7H12M13S P12DT7H12M13.3S P12DT7H12M13.45S P12DT7H12M13.455S PT7H12M13S PT7H12M13.2S PT7H12M13.56S PT7H12M13.999S 7d 5h 24m 13s

// Assumes there is <time id="t"> element in the HTML

const t = document.getElementById("t");
t.dateTime = "6w 5h 34m 5s";