I am having trouble passing R CMD check without warnings because of the following error
* checking for future file timestamps ...Warning in file(con, "r") : cannot open URL 'http://worldclockapi.com/api/json/utc/now': HTTP status was '403 Forbidden' WARNING unable to verify current time
Looking at the code in R-devel
tools:::.check_packages(), it seems that the future file stamps is enabled when checking
as-cran. Is there a way to around this on travis-CI (Until this gets fixed in R-devel)?