avoid using testthat functions in package code for is.time and is.date
avoid using testthat functions in package code for is.time and is.date

rstudio/sparklyr,kevinykuo/sparklyr,rstudio/sparklyr,kevinykuo/sparklyr,rstudio/sparklyr,kevinykuo/sparklyr,kevinykuo/sparklyr,rstudio/sparklyr