Extracts a specific parameter from a year unit object constructed by
era_year().
See also
Other era helper functions:
era,
era_parameters,
era_year,
is_era(),
is_era_year(),
is_yr(),
this_year()
Examples
julian <- era_year("Julian", 365.25)
era_year_label(julian)
#> [1] "Julian"
era_year_days(julian)
#> [1] 365.25