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Backport PR #22871 on branch v3.5.x (Fix year offset not always being added) #22878

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Merged
merged 1 commit into from
Apr 22, 2022
Merged

Backport PR #22871 on branch v3.5.x (Fix year offset not always being added) #22878

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6 changes: 4 additions & 2 deletions lib/matplotlib/dates.py
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Original file line number Diff line number Diff line change
Expand Up @@ -797,8 +797,10 @@ def format_ticks(self, values):
# mostly 0: years, 1: months, 2: days,
# 3: hours, 4: minutes, 5: seconds, 6: microseconds
for level in range(5, -1, -1):
if len(np.unique(tickdate[:, level])) > 1:
if level < 2:
unique = np.unique(tickdate[:, level])
if len(unique) > 1:
# if 1 is included in unique, the year is shown in ticks
if level < 2 and np.any(unique == 1):
show_offset = False
break
elif level == 0:
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4 changes: 4 additions & 0 deletions lib/matplotlib/tests/test_dates.py
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Expand Up @@ -621,6 +621,10 @@ def test_offset_changes():
ax.set_xlim(d1, d1 + datetime.timedelta(weeks=3))
fig.draw_without_rendering()
assert formatter.get_offset() == '1997-Jan'
ax.set_xlim(d1 + datetime.timedelta(weeks=7),
d1 + datetime.timedelta(weeks=30))
fig.draw_without_rendering()
assert formatter.get_offset() == '1997'
ax.set_xlim(d1, d1 + datetime.timedelta(weeks=520))
fig.draw_without_rendering()
assert formatter.get_offset() == ''
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