This utility function takes a set of chronons and identifies a common chronon of the finest granularity that can represent all input chronons without loss of information. This is useful for operations that require a shared time unit, such as combining or comparing different time measured at different precisions.
chronon_common(..., .ptype = NULL)A set of chronons to find a common chronon for.
If NULL, the default, the output returns the common chronon
across all elements of .... Alternatively, a prototype chronon can be
supplied to .ptype to demand a specific chronon is used. If the supplied
.ptype cannot represent all input chronons without loss of information,
an error is raised.
A time unit object representing the common chronon.
# The common chronon between days and weeks is a day
chronon_common(tu_day(1L), tu_week(1L))
#> Error in chronon_common(tu_day(1L), tu_week(1L)): could not find function "chronon_common"
# The common chronon between days and months is a day
chronon_common(tu_week(1L), tu_month(1L))
#> Error in chronon_common(tu_week(1L), tu_month(1L)): could not find function "chronon_common"
# The common chronon between hours, months, and years is an hour
chronon_common(tu_hour(1L), tu_month(1L), tu_year(1L))
#> Error in chronon_common(tu_hour(1L), tu_month(1L), tu_year(1L)): could not find function "chronon_common"
# The common chronon between months, quarters, and years is a month
chronon_common(tu_month(1L), tu_quarter(1L), tu_year(1L))
#> Error in chronon_common(tu_month(1L), tu_quarter(1L), tu_year(1L)): could not find function "chronon_common"