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FIX: allow zero and one as dates via wrapping #15416

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FIX: allow zero and one as dates via wrapping #15416

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15 changes: 3 additions & 12 deletions lib/matplotlib/dates.py
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Original file line number Diff line number Diff line change
Expand Up @@ -281,6 +281,9 @@ def _from_ordinalf(x, tz=None):

ix, remainder = divmod(x, 1)
ix = int(ix)
# force to valid date via wrapping....
dt10k = 3652059
ix = (ix - 1) % dt10k + 1
if ix < 1:
raise ValueError('Cannot convert {} to a date. This often happens if '
'non-datetime values are passed to an axis that '
Expand Down Expand Up @@ -1077,12 +1080,6 @@ def datalim_to_dt(self):
dmin, dmax = self.axis.get_data_interval()
if dmin > dmax:
dmin, dmax = dmax, dmin
if dmin < 1:
raise ValueError('datalim minimum {} is less than 1 and '
'is an invalid Matplotlib date value. This often '
'happens if you pass a non-datetime '
'value to an axis that has datetime units'
.format(dmin))
return num2date(dmin, self.tz), num2date(dmax, self.tz)

def viewlim_to_dt(self):
Expand All @@ -1092,12 +1089,6 @@ def viewlim_to_dt(self):
vmin, vmax = self.axis.get_view_interval()
if vmin > vmax:
vmin, vmax = vmax, vmin
if vmin < 1:
raise ValueError('view limit minimum {} is less than 1 and '
'is an invalid Matplotlib date value. This '
'often happens if you pass a non-datetime '
'value to an axis that has datetime units'
.format(vmin))
return num2date(vmin, self.tz), num2date(vmax, self.tz)

def _get_unit(self):
Expand Down
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