## The time will be set to midnight when converting from `jdate` or `Date`
as_jdatetime(jdate_now())
as_jdatetime(Sys.Date())
## We can change time zone of a `jdatetime` to a new time zone
as_jdatetime(jdatetime_now(tzone = "Iran"), tzone = "Asia/Tokyo")
Run the code above in your browser using DataLab