Zeiss Datetime

[maxfscher]

Hi all,

thanks for this intuitive and easy to use dicom converter. I have some data from a Zeiss scanner (I know you explicitly mention that you only provide base level compabilities). Thus I was also not surprised that the conversion did not work out of the box. I tried converting the data and got the error: ValueError: Invalid isoformat string: '2024-09-27T13:49:45.4425991Z'
Within the file #https://github.com/imi-bigpicture/wsidicomizer/blob/main/wsidicomizer/sources/czi/czi_metadata.py

added the parts in bold however solved the issue for me and the conversion produced totally fine DICOM files:

def aquisition_datetime(self) -> Optional[datetime]: value = self.get_value_from_element( self._metadata, "AcquisitionDateAndTime", str, nested=["Metadata", "Information", "Image"], ) **value=value.rstrip('Z') value=value[:26]** return datetime.fromisoformat(value)

Stripping the length of the time to only milliseconds was also necessary since the datetime tag in DICOM has a maximum lenght of 16.

[erikogabrielsson]

Hi @maxfscher and thanks for reporting this issue.
Are you using a python version prior to 3.11? If so, then the ValueError might be due that older python versions did not have as nice isoformat parsing. https://docs.python.org/3/library/datetime.html#datetime.datetime.fromisoformat
Removing the z and the last decimal seems to work.

For the datetime formatting into a DICOM dataset, this is handled by pydicom's DT class, which should format a correct DICOM element for any valid datetime-object (I hope...).

Would you like to make a PR to fix this issue?