To specify the package that you want to use for a function with the same name, the syntax is:
You would have already noticed that the order of loading the packages makes a difference, i.e. the package that gets loaded last will mask the functions in packages loaded earlier.
In other words, use packagename::functionname() to avoid masking.
In addition, if you know that you will always want to use the function in chron package, you can define your own function as follows:
is.weekend <- chron::is.weekend
If you want to explore more in R programming then watch this R programming tutorial for beginner: