To search for a specific period in an instrument's history, start_date and end_date parameters are your primary tools. However, mastering this technique requires understanding a few key nuances.
start_date
Using this parameter alone has no effect unless start_date exceeds the range specified by outputsize.
Example
https://api.twelvedata.com/time_series?start_date=2020-05-06&outputsize=5&symbol=aapl&interval=1day&apikey=xxx
This request will return the most recent 5 records, as the condition is met. However, if the start_date falls within the range between the current day and the outputsize limit, truncation will occur.
end_date: This parameter defines the maximum possible datetime value for the time series.
Example
https://api.twelvedata.com/time_series?end_date=2020-05-06&outputsize=5&symbol=aapl&interval=1day&apikey=xxx
In this case, the output will include the last five records: [2020-05-05, 2020-05-04, 2020-05-01, 2020-04-30, 2020-04-29]. The number of rows is entirely determined by the outputsize parameter.
start_date and end_date: When used together, these parameters set the lower and upper boundaries for the response.
Example:
https://api.twelvedata.com/time_series?start_date=2020-01-06&end_date=2020-05-06&symbol=aapl&interval=1day&apikey=xxx
This request returns all values between the specified dates. Note that the outputsize parameter is omitted in this case; including it would restrict the output.
General Recommendations:
A maximum of 5,000 data points can be retrieved in a single request. This limitation exists to ensure optimal server processing and maintain performance standards.
Before deploying to production, ensure a thorough understanding of how these parameters behave, particularly in edge cases.
To access specific sets of data efficiently, always include appropriate
start_dateandend_dateparameters in your API calls.