BUG: .dt.isocalendar().year · Issue #36032 · pandas-dev/pandas (original) (raw)

Skip to content

Navigation Menu

• • GitHub Copilot Write better code with AI
  • GitHub Advanced Security Find and fix vulnerabilities
  • Actions Automate any workflow
  • Codespaces Instant dev environments
  • Issues Plan and track work
  • Code Review Manage code changes
  • Discussions Collaborate outside of code
  • Code Search Find more, search less
• Explore
  • Learning Pathways
  • Events & Webinars
  • Ebooks & Whitepapers
  • Customer Stories
  • Partners
  • Executive Insights
• • GitHub Sponsors Fund open source developers
  • The ReadME Project GitHub community articles
• • Enterprise platform AI-powered developer platform
• Pricing

Provide feedback

Saved searches

Use saved searches to filter your results more quickly

Sign up

Appearance settings

Description

Code Sample, a copy-pastable example

import pandas as pd

df = pd.DataFrame( { "Date": [ pd.to_datetime("2016-01-01"), pd.to_datetime("2016-01-04"), pd.to_datetime("2016-01-05"), pd.to_datetime("2016-01-06"), pd.to_datetime("2016-01-07"), pd.to_datetime("2016-01-08"), ] } ) df["Date"].dt.isocalendar().year

Problem description

new function .dt.isocalendar().year returns wrong value for the day of pd.to_datetime('2016-01-08'). It is supposed to return 2016 but 2017

please check on that