Sample OEMs do not work with oacmpy

[khoohuibo]

Describe the bug
I've originally came across your samples folder in a google search when looking for other example OEM other than the ones provided in ccsds2czml: https://gitlab.com/jorispio/ccsds2czml/-/tree/master/example

All OEM files in samples/real threw a generic datetime microsecond error, but i could not discern any differences between your OEMs and the sample_OEM generated by ccsds2czml. Their sample_OEM worked fine. Below is the traceback error:

C:\Users\khoohuibo\Desktop\ccsds2czml-master>python -m oacmpy -i LEO_10s.oem -o one_sat.czml -v
Input File : LEO_10s.oem
Output File: one_sat.czml
  File:  LEO_10s.oem
Traceback (most recent call last):
  File "C:\Users\Hubert Khoo\.conda\envs\arcsim\lib\runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "C:\Users\Hubert Khoo\.conda\envs\arcsim\lib\runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "C:\Users\Hubert Khoo\.conda\envs\arcsim\lib\site-packages\oacmpy\__main__.py", line 5, in <module>
    main(sys.argv[1:])
  File "C:\Users\Hubert Khoo\.conda\envs\arcsim\lib\site-packages\oacmpy\oem2czml.py", line 78, in main
    _ccsds2czml(inputfile, outputfile, verbose)
  File "C:\Users\Hubert Khoo\.conda\envs\arcsim\lib\site-packages\oacmpy\oem2czml.py", line 35, in _ccsds2czml
    print(" Simulation time span: {} - {}".format(start, end))
  File "C:\Users\Hubert Khoo\.conda\envs\arcsim\lib\site-packages\oacmpy\datetime\Date.py", line 297, in __str__
    return self.strftime(ISO8601_FORMAT_Z)
  File "C:\Users\Hubert Khoo\.conda\envs\arcsim\lib\site-packages\oacmpy\datetime\Date.py", line 291, in strftime
    return self.datetime.strftime(fmt)
  File "C:\Users\Hubert Khoo\.conda\envs\arcsim\lib\site-packages\oacmpy\datetime\Date.py", line 251, in datetime
    self._datetime = datetime(year=year, month=month, day=day, hour=h, minute=m, second=s, microsecond=ms)
ValueError: microsecond must be in 0..999999

I have attached the sample_object.oem file generated for easier reference
sample_object.zip

Steps to Reproduce

1. Download both repositories
2. Run the following code in the root directory of ccsds2czml-master to generate a sample_OEM file

python -m example.single.simple_oem

3. Generate CZML file using sample_object.oem file generated in root directory of ccsds2czml-master, using the code below

python -m oacmpy -i sample_object.oem -o one_sat.czml -v

4. Visualize using Cesium Viewer
5. Attempt to generate CZML file by using OEM file from oem-master/samples/real, (Used LEO_10s and GEO_20s)
6. Obtain traceback error as described

# Insert reproducing code snippet here

Python/Package Version Information
Python: [e.g. 3.5.1]
oem: [e.g. 1.0.0]

[bradsease]

Interesting. I'm not familiar with oacmpy but I generated those sample ephemerides with STK, so they should be valid.

Just speculating here, but maybe they don't properly support arbitrary precision for fractional seconds? That's the only difference I see between my example and the one you provided.

[khoohuibo]

I found out that the oacmpy library created their own Date class out of python.datetime, and they didnt have an function of looping a million microseconds back to a second, so that caused an error(aka mircosecond went above 999999).

So this is a problem with their library, not yours. I'm sorry to bother you. The OEM i generated were also from STK so i was very confused when using theirs.