# The timezone used for conversion is the system’s default timezone unless pandas2ri.default_timezone is specified… or unless the time zone is specified in the original time  object:

pd_tz_df = pd.DataFrame({
                'Timestamp': pd.date_range('2017-01-01 00:00:00', periods=10, freq='s',tz='UTC')
                })



with localconverter(ro.default_converter + pandas2ri.converter):
      r_from_pd_tz_df = ro.conversion.py2rpy(pd_tz_df)
print(r_from_pd_tz_df)
                Timestamp
    0 2017-01-01 00:00:00
    1 2017-01-01 00:00:01
    2 2017-01-01 00:00:02
    3 2017-01-01 00:00:03
    4 2017-01-01 00:00:04
    5 2017-01-01 00:00:05
    6 2017-01-01 00:00:06
    7 2017-01-01 00:00:07
    8 2017-01-01 00:00:08
    9 2017-01-01 00:00:09