lubridate

R package lubridate: Make Dealing with Dates a Little Easier. Functions to work with date-times and time-spans: fast and user friendly parsing of date-time data, extraction and updating of components of a date-time (years, months, days, hours, minutes, and seconds), algebraic manipulation on date-time and time-span objects. The ’lubridate’ package has a consistent and memorable syntax that makes working with dates easy and fun.