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Lubridate offers two functions to see the date and date-time, at the moment, in the system. Use them to see the time in your time zone.
There is a base function named “difftime” to find time difference between two times. Now use this to find out the time difference in weeks between.
x <- "11 th april 2012"
y <- "April 24th 2018 11:59:59"
Do the same as above and find the difference between the system time and x, in hours.
Lets say we have:
x <- "11 th april 2018 11.30.00"
We want to add one day to x. How do we achieve that?
Now add 100 hours to x and find which date-time it is.
Now, how can we get the date-time of 3 weeks prior to x?
Now, read about the duration and spans from lubridate’s vignette. Try getting the date-time 10 years prior to x first by subtracting with years and then by using 10 year duration’s. See if they are similar and try to reason it.