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A set of predicates and assertions for checking the properties of dates and times. Most of the documentation is on the assertive page. End-users will usually want to use assertive directly.


To install the stable version, type:


To install the development version, you first need the devtools package.


Then you can install the assertive.datetimes package using



is_date_string checks character vectors to see if they contain dates and times.

is_before, and is_after check whether Dates or POSIXt objects are before or after some time.

is_in_past and is_in_future are like the above, compared to the present time.


All predicates return a vector and have two corresponding assertions. For example, is_after has assert_all_are_after and assert_any_are_after.

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assertive.datetimes documentation built on July 31, 2020, 1:06 a.m.