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POSIXlt returns a class-appropriate object. As, if tz was specified. The "tzone" attribute will be assigned by POSIXlt. Dates and times that are known to be incorrect will be returned as NA.

The way the values are kept internally differs between the two POSIX date/time classes. The POSIXct class saves date/time data as a list with elements for second, minute, hour, day, month, and year, among others, whereas the POSIXlt class stores them as a list with elements for second, minute, hour, day, month, and year.

Both classes inherit a virtual class called "POSIXt," which is used to allow operations like subtraction to be performed on them. The "POSIXlt" components wday and yday are informational only and are not used in the conversion to calendar time.

In R, you may use the methods POSIXct() and format() to retrieve the year from a date. Here's an example of how to get the year from a date: POSIXct("02/03/2014 10:41:00", format = "percent m/ percent d/ percent Y percent H: percent M: percent S") and format(date, format="percent Y")

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