I'm new to Python and I'm using xarray. My netcdf file contains data with time given in 'days since 0001-01-01 00:00:00', calendar type is Julian. Does anybody know an easy way to convert the time to standard calendar?

我是新手，我使用的是XARRAY。我的netcdf文件包含时间为‘天数自0001-01-01 00：00：00’的数据，日历类型为Julian。有谁知道将时间转换成标准日历的简单方法吗？

Thanks in advance :)

提前感谢：)

xarray.Dataset.convert_calendar() 

didn't work for me

对我来说不管用

datetime.datetime.strptime(Dataset.time, "%Y %m %d %H %M")

and similar also did not work.

而类似的做法也没有奏效。

You can convert Julian dates to a standard calendar (usually Gregorian) in xarray using cftime library. Here's a minimal example:

您可以使用cftime库将儒略日期转换为标准日历(通常为公历)。下面是一个最小的例子：

1. Install cftime: pip install cftime


2. Convert time coordinates.

import xarray as xr
import cftime

# Load your dataset
ds = xr.open_dataset('your_file.nc')

# Convert Julian to standard calendar (e.g., Gregorian)
ds['time'] = xr.coding.times.decode_cf_datetime(ds['time'], calendar='gregorian')

# Now ds['time'] is in Gregorian

Note: Replace 'your_file.nc' with your NetCDF file path.

注意：将‘you_file.nc’替换为您的NetCDF文件路径。

Hope that helps!

希望这能有所帮助！