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Custom Intraday Bars

Anyone ever have trouble getting custom intraday bars (e.g. 15-minute or 30-minute bars)? Q gives you access to one-minute bars via the data.history() function that you can easily turn into any bar length that you want. Thank you pandas! This tripped me up when I got started, so hopefully it can help some of you out there.

The attached algo is setup to get variable minute bars for Apple. It logs the one-minute bars and logs the custom bars so that you can easily check to see if the bars are calculated correctly. A couple of key points:

  • How to call a function every x minutes of the trading day (lines 24-27).
  • How to use the pandas DataFrame resample function (lines 51-60).

For those that want a detailed description for how this works, you can see my write up on this.


Clone Algorithm
Backtest from to with initial capital
Total Returns
Max Drawdown
Benchmark Returns
Returns 1 Month 3 Month 6 Month 12 Month
Alpha 1 Month 3 Month 6 Month 12 Month
Beta 1 Month 3 Month 6 Month 12 Month
Sharpe 1 Month 3 Month 6 Month 12 Month
Sortino 1 Month 3 Month 6 Month 12 Month
Volatility 1 Month 3 Month 6 Month 12 Month
Max Drawdown 1 Month 3 Month 6 Month 12 Month
# Backtest ID: 59c131d5d4a54f54df0e0ba8
There was a runtime error.
4 responses

Thanks for sharing this helper code!


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Hi Aaron,

Thanks for putting this together for intraday bars. Really helpful.

I was wondering if there's an elegant way to get INTER-day bars as well?

4 hour interday bars. With ohlcv values calculted every 4 hours through the backtest timeframe with:
- 1st bar at 1:30 pm of day 1 (9:30am to 1:30pm = 4 hr)
- 2nd bar at 11:00 am of day 2 (1:30pm to 11:00am = 4 hr; 2.5 from last day and 1.5 from current day)
- 3rd bar at 2:00 pm of day 2 (11:00am to 3:00pm)
- 4th bar at 12:00 pm of day 3 (3:00pm to 12:00pm)
- .
- .


Quantopian doesn't supply equity price/volume data outside of trading hours. So the coverage of any intraday bars is restricted to 9:30am-4pm, on trading days only.

@Dan Dunn - how about for 24 hour futures contracts?