issues: 235224055

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id node_id number title user state locked assignee milestone comments created_at updated_at closed_at author_association active_lock_reason draft pull_request body reactions performed_via_github_app state_reason repo type
235224055 MDU6SXNzdWUyMzUyMjQwNTU= 1449 time.units truncated when saving to_netcdf 10194086 closed 0     6 2017-06-12T12:58:37Z 2023-09-13T13:25:25Z 2023-09-13T13:25:24Z MEMBER      

When I manually specify the units attribute for time, and then save the Dataset to_netcdf the string is truncated. See exaple

import pandas as pd
import xarray as xr

time = pd.date_range('2000-01-01', '2000-01-31', freq='6h')
ds = xr.Dataset(coords=dict(time=time))

units = 'days since 1975-01-01 00:00:00'
calendar = 'gregorian'
encoding=dict(time=dict(units=units, calendar=calendar))

ds.to_netcdf('test.nc', format='NETCDF4_CLASSIC', encoding=encoding)

! ncdump -h test.nc
# time:units = "days since 1975-01-01" ;

Some programs seem to require the hours to be present to interpret the time properly (e.g. panoply). When specifying the hour, a 'T' is added.

units = 'days since 1975-01-01 01:00:00'

! ncdump -h test.nc
# time:units = "days since 1975-01-01T01:00:00" ;

When xarray defines the time.units it works fine.

ds = xr.Dataset(coords=dict(time=time))
ds.to_netcdf('test.nc', format='NETCDF4_CLASSIC',)

! ncdump -h test.nc
# time:units = "hours since 2000-01-01 00:00:00" ;

xarray version 0.9.6

 
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