# Why can I only select 1 day of Seasonal Forecast data from the CDS?

**URL:** <https://forum.ecmwf.int/t/why-can-i-only-select-1-day-of-seasonal-forecast-data-from-the-cds/1142>\
**Category:** C3S - Access and Login\
**Tags:** seasonal\_forecast, access, c3s\
**Created:** [15 January 2020 14:53 UTC](https://forum.ecmwf.int/t/why-can-i-only-select-1-day-of-seasonal-forecast-data-from-the-cds/1142 "2020-01-15T14:53:42Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Anabelle](https://forum.ecmwf.int/user_avatar/forum.ecmwf.int/anabelle/32/360_2.png) [@Anabelle](https://forum.ecmwf.int/u/Anabelle)\
**Post date:** [15 January 2020 14:53 UTC](https://forum.ecmwf.int/t/why-can-i-only-select-1-day-of-seasonal-forecast-data-from-the-cds/1142/1 "2020-01-15T14:53:42Z")

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While downloading data from ECMWF originating center, we can select only day 1. I need forecast for all days in hindcast period. Day shows start date day.

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<div class="post-metadata">

**Author:** ![Anabelle](https://forum.ecmwf.int/user_avatar/forum.ecmwf.int/anabelle/32/360_2.png) [@Anabelle](https://forum.ecmwf.int/u/Anabelle)\
**Post date:** [15 January 2020 14:55 UTC](https://forum.ecmwf.int/t/why-can-i-only-select-1-day-of-seasonal-forecast-data-from-the-cds/1142/2 "2020-01-15T14:55:44Z")

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Some of the modelling centres (including ECMWF) only run their models on day 1 of each month, but the output data cover all days out to ~7 months (e.g. 1/1/1993 hindcast will have data for all days out to July 1993, 1/2/1993 hindcast will have all data out to August 1993, etc).

Please check the dataset documentation for details:

[Documentation for C3S seasonal datasets in the CDS](https://confluence.ecmwf.int/display/COPSRV/Documentation+for+C3S+seasonal+datasets+in+the+CDS)&nbsp;