Yf.download Date ((new)) May 2026

The yf.download function is a core utility of the yfinance library used to fetch historical market data from Yahoo Finance . When developers search for , they are typically looking for how to specify precise timeframes for their financial datasets. Basic Syntax for Date Selection

: An alternative to start/end dates. Valid options include 1d , 5d , 1mo , 3mo , 6mo , 1y , 2y , 5y , 10y , ytd , and max . You should not use period and start/end together, as it can cause unpredictable behavior. Accepted Date Formats The library is flexible with input formats, accepting: Strings : Use the "YYYY-MM-DD" format (e.g., "2024-05-15" ). yf.download date

: You can use the Python datetime module to programmatically define ranges. The yf

: The beginning date of the data request. It is inclusive , meaning the first data point will be from this exact date if it was a trading day. Valid options include 1d , 5d , 1mo

import yfinance as yf # Example: Downloading data for a specific range data = yf.download("AAPL", start="2023-01-01", end="2023-12-31") Use code with caution. Key Parameters for Timeframes

The yf.download function uses two primary parameters for custom timeframes: start and end .

from datetime import datetime, timedelta import yfinance as yf # Dynamic range: Last 30 days end_date = datetime.now() start_date = end_date - timedelta(days=30) df = yf.download("MSFT", start=start_date, end=end_date) Use code with caution. Important Limitations pythonfintech.comhttps://pythonfintech.com How to download market data with yfinance and Python