DateCoercion

Convert every date method we know about to POSIXlt and
  POSIXct

internal

Lubridate makes it easier to work with dates and times by
        providing functions to identify and parse date-time data,
        extract and modify components of a date-time (years, months,
        days, hours, minutes, and seconds), perform accurate math on
        date-times, handle time zones and Daylight Savings Time.
        Lubridate has a consistent, memorable syntax, that makes
        working with dates fun instead of frustrating.

DateCoercion: Convert every date method we know about to POSIXlt and POSIXct

Description

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