def isoformat():
make sure series with label converts to JSON properly
dataset/ETHPy150Open nlloyd/SubliminalCollaborator/libs/zope/interface/common/idatetime.py/IDate.isoformat--crossover with--dataset/ETHPy150Open unbracketed/python-flot-utils/pyflot/tests/__init__.py/TestFlot.test_series_with_label_json