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x
Check if x is a iso-year-week-day.
is_iso_year_week_day(x)
Returns TRUE if x inherits from "clock_iso_year_week_day", otherwise returns FALSE.
TRUE
"clock_iso_year_week_day"
FALSE
[object]
An object.
is_iso_year_week_day(iso_year_week_day(2019))
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