make a copy of the underlying data ambiguous [‘infer’, bool-ndarray, ‘NaT’, default ‘raise’] When clocks moved backward due to DST, ambiguous times may arise. For example in Central European Time (UTC+01) nonexistent [str, default ‘raise’] A nonexistent time does not exist in a particular timezone where clocks moved forward due to DST. Valid valuse are: • ‘shift_forward’ will shift the nonexistent time forward information preserving local time. ambiguous [‘infer’, ‘NaT’, bool array, default ‘raise’] When clocks moved backward due to DST, ambiguous times may arise. For example in Central European Time (UTC+01)

daylight savings time (DST) in a local time zone causes some times to occur twice within one day (“clocks fall back”). The following options are available: • 'raise': Raises a pytz.AmbiguousTimeError (the A DST transition may also shift the local time ahead by 1 hour creating nonexistent local times (“clocks spring forward”). The behavior of localizing a timeseries with nonexistent times can be controlled make a copy of the underlying data. ambiguous [‘infer’, bool-ndarray, ‘NaT’, default ‘raise’] When clocks moved back- ward due to DST, ambiguous times may arise. For example in Central European Time (UTC+01)

daylight savings time (DST) in a local time zone causes some times to occur twice within one day (“clocks fall back”). The following options are available: • 'raise': Raises a pytz.AmbiguousTimeError (the A DST transition may also shift the local time ahead by 1 hour creating nonexistent local times (“clocks spring forward”). The behavior of localizing a timeseries with nonexistent times can be controlled make a copy of the underlying data ambiguous [‘infer’, bool-ndarray, ‘NaT’, default ‘raise’] When clocks moved backward due to DST, ambiguous times may arise. For example in Central European Time (UTC+01)

daylight savings time (DST) in a local time zone causes some times to occur twice within one day (“clocks fall back”). The following options are available: • 'raise': Raises a pytz.AmbiguousTimeError (the A DST transition may also shift the local time ahead by 1 hour creating nonexistent local times (“clocks spring forward”). The behavior of localizing a timeseries with nonexistent times can be controlled make a copy of the underlying data ambiguous [‘infer’, bool-ndarray, ‘NaT’, default ‘raise’] When clocks moved backward due to DST, ambiguous times may arise. For example in Central European Time (UTC+01)

University 2020 1. Watermarks must be monotonically increasing in order to ensure that the event time clocks of tasks are progressing and not going backwards. 2. A watermark with a timestamp T indicates that

daylight savings time (DST) in a local time zone causes some times to occur twice within one day (“clocks fall back”). The following options are available: • 'raise': Raises a pytz.AmbiguousTimeError (the A DST transition may also shift the local time ahead by 1 hour creating nonexistent local times (“clocks spring forward”). The behavior of localizing a timeseries with nonexistent times can be controlled make a copy of the underlying data. ambiguous [‘infer’, bool-ndarray, ‘NaT’, default ‘raise’] When clocks moved back- ward due to DST, ambiguous times may arise. For example in Central European Time (UTC+01)

daylight savings time (DST) in a local time zone causes some times to occur twice within one day (“clocks fall back”). The following options are available: • 'raise': Raises a pytz.AmbiguousTimeError (the A DST transition may also shift the local time ahead by 1 hour creating nonexistent local times (“clocks spring forward”). The behavior of localizing a timeseries with nonexistent times can be controlled make a copy of the underlying data. ambiguous [‘infer’, bool-ndarray, ‘NaT’, default ‘raise’] When clocks moved back- ward due to DST, ambiguous times may arise. For example in Central European Time (UTC+01)

daylight savings time (DST) in a local time zone causes some times to occur twice within one day (“clocks fall back”). The following options are available: • 'raise': Raises a pytz.AmbiguousTimeError (the A DST transition may also shift the local time ahead by 1 hour creating nonexistent local times (“clocks spring forward”). The behavior of localizing a timeseries with nonexistent times can be controlled make a copy of the underlying data. ambiguous [‘infer’, bool-ndarray, ‘NaT’, default ‘raise’] When clocks moved back- ward due to DST, ambiguous times may arise. For example in Central European Time (UTC+01)

daylight savings time (DST) in a local time zone causes some times to occur twice within one day (“clocks fall back”). The following options are available: • 'raise': Raises a pytz.AmbiguousTimeError (the A DST transition may also shift the local time ahead by 1 hour creating nonexistent local times (“clocks spring forward”). The behavior of localizing a timeseries with nonexistent times can be controlled make a copy of the underlying data. ambiguous [‘infer’, bool-ndarray, ‘NaT’, default ‘raise’] When clocks moved back- ward due to DST, ambiguous times may arise. For example in Central European Time (UTC+01)

daylight savings time (DST) in a local time zone causes some times to occur twice within one day (“clocks fall back”). The following options are available: • 'raise': Raises a pytz.AmbiguousTimeError (the A DST transition may also shift the local time ahead by 1 hour creating nonexistent local times (“clocks spring forward”). The behavior of localizing a timeseries with nonexistent times can be controlled make a copy of the underlying data. ambiguous [‘infer’, bool-ndarray, ‘NaT’, default ‘raise’] When clocks moved back- ward due to DST, ambiguous times may arise. For example in Central European Time (UTC+01)