python data_error ai_generated true

ValueError: Date ordinal 737791 is not a valid date for the Gregorian calendar.

ID: python/matplotlib-date-parser-error

Also available as: JSON · Markdown · 中文
80%Fix Rate
83%Confidence
0Evidence
2024-05-15First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
3.8 active — — —
3.9 active — — —

Root Cause

Using matplotlib's date2num or num2date with an out-of-range ordinal, often due to incorrect conversion of dates before year 1 or after year 9999.

generic

中文

使用matplotlib的date2num或num2date时，传入的序数超出范围，通常是由于转换了公元1年之前或9999年之后的日期。

Workarounds

  1. 90% success Ensure dates are within the Gregorian calendar range (year 1 to 9999) 
    from datetime import datetime; date = datetime(2024, 1, 1); ordinal = matplotlib.dates.date2num(date)
  2. 85% success Use pandas date handling before plotting 
    import pandas as pd; dates = pd.date_range('2024-01-01', periods=10); plt.plot_date(dates, values)

Dead Ends

Common approaches that don't work:

  1. Ignoring the error and continuing 80% fail

    The plot may be incorrect or missing data points.

  2. Using a different date library like datetime 50% fail

    The error is in matplotlib's conversion; datetime may still produce valid ordinals but the issue is with the range.