tz_time_diff {photobiology}

Time difference between two time zones

Description

Returns the difference in local time expressed in hours between two time zones at a given instant in time. The difference due to daylight saving time or Summer and Winter time as well as historical changes in time zones are taken into account.

Usage

tz_time_diff(
  when = lubridate::now(),
  tz.target = lubridate::tz(when),
  tz.reference = "UTC"
)

Arguments

when

datetime A time instant

tz.target, tz.reference

character Two time zones using names recognized by functions from package 'lubridate'

Value

A numeric value.

Note

This function is implemented using functions from package 'lubridate'. For details on the handling of time zones, please, consult the documentation for Sys.timezone about system differences in time zone names and handling.