Hello @Rilecs
I can replicate the same behavior using https://community.developers.lseg.com/home/leaving?allowTrusted=1&target=https%3A%2F%2Fdevelopers.lseg.com%2Fen%2Fapi-catalog%2Flseg-data-platform%2Flseg-data-library-for-python version 2.1.1 and Desktop (Workspace) session. When I enable the library log file on the lseg-data.config.json file, log file shows that the Workspace backend server sent data from 2026-06-02 to 2026-06-10 to the library.
Request id 2 url = http://localhost:9001/api/rdp/data/historical-pricing/v1/views/interday-summaries/LCOc1?interval=P1D &start=2026-06-01T00%3A00%3A00.000000000Z&end=2026-06-10T00%3A00%3A00.000000000Z &fields=SETTLE%2CDATE method = GET headers = {'request-timeout': '20', 'x-tr-applicationid': 'LD-PYTHON-LIB', 'Authorization': 'Bearer token'} [2026-06-11T10:47:46.855657+07:00] - [sessions.desktop.workspace.0] - [DEBUG] - [25748 - HistoricalRequestThread_0] - [http_service] - [request] - HTTP Response id 2 status_code = 200 text = [{"universe":{"ric":"LCOc1"},"interval":"P1D","summaryTimestampLabel":"endPeriod","adjustments": ["exchangeCorrection","manualCorrection","CCH","CRE","RTS","RPO"],"defaultPricingField":"SETTLE","headers" :[{"name":"DATE","type":"string"},{"name":"SETTLE","type":"number","decimalChar":"."}],"data":[["2026-06-10",93.1], ["2026-06-09",91.45], ["2026-06-08",94.25], ["2026-06-05",93.09], ["2026-06-04",95.03], ["2026-06-03",97.81], ["2026-06-02",96]],"meta":{"blendingEntry":{"headers":[{"name":"DATE","type":"string"} ,{"name":"SETTLE","type":"number","decimalChar":"."}],"data":[["2026-06-10",93.1]]}}}]
However, if I change the code to request data from 2026-05-31 to 2026-06-10, it returns 2026-06-01 data. Please ask the client to try it.
@Rilecs
I think this is because the API adds time components to the start and end dates.
http://localhost:9001/api/rdp/data/historical-pricing/v1/views/interday-summaries/LCOc1?interval=P1D &start=2026-06-01T00%3A00%3A00.000000000Z&end=2026-06-10T00%3A00%3A00.000000000Z
I will contact the product team to verify this.