# Multiple occurrence ids for one webinar day

**URL:** <https://devforum.zoom.us/t/multiple-occurrence-ids-for-one-webinar-day/16756>\
**Category:** API and Webhooks\
**Created:** [May 8, 2020, 11:53am UTC](https://devforum.zoom.us/t/multiple-occurrence-ids-for-one-webinar-day/16756 "2020-05-08T11:53:46Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![priya.jetley](https://avatars.discourse-cdn.com/v4/letter/p/b3f665/32.png) [@priya.jetley](https://devforum.zoom.us/u/priya.jetley)\
**Post date:** [May 8, 2020, 11:53am UTC](https://devforum.zoom.us/t/multiple-occurrence-ids-for-one-webinar-day/16756/1 "2020-05-08T11:53:46Z")

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Hello,

I am using the Zoom API to retrieve my webinar’s participant information.  
I am aware that for each day of a webinar a new occurrence id is generated.  
However, I also noticed that for some days there are two occurrence ids and therefore 2 reports for the same day of the webinar are available.  
My guess is that when the webinar is closed by the host, say for a break and then reopened on the same day then a new occurrence id is generated.  
Is this correct? If not, could you please throw some light on the same.  
We are in the process of generating participation grade reports and this is proving to be an issue.

Thanks very much.  
Best Regards,  
Priya

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**Author:** ![michael.zoom](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/michael.zoom/32/37213_2.png) [@michael.zoom](https://devforum.zoom.us/u/michael.zoom)\
**Post date:** [May 13, 2020, 3:49pm UTC](https://devforum.zoom.us/t/multiple-occurrence-ids-for-one-webinar-day/16756/2 "2020-05-13T15:49:56Z")

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Hi @priya.jetley, yes, every instance a Webinar is started and then ended, a new occurrence (UUID) is created. You will be able to use the [List Past Webinar Instances API](https://marketplace.zoom.us/docs/api-reference/zoom-api/webinars/pastwebinars) to compare whether UUIDs share the same start date.

Let us know if we can help further 🙂

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**Author:** ![priya.jetley](https://avatars.discourse-cdn.com/v4/letter/p/b3f665/32.png) [@priya.jetley](https://devforum.zoom.us/u/priya.jetley)\
**Post date:** [May 13, 2020, 4:55pm UTC](https://devforum.zoom.us/t/multiple-occurrence-ids-for-one-webinar-day/16756/3 "2020-05-13T16:55:12Z")

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Hi Micheal,

Thanks for confirming this.  
I am in the middle of a zoom participant report related issue concerning such webinar.  
Could you please take a look at this thread too and give me some advise.

> [@Webinar participant data is inaccurate](https://devforum.zoom.us/t/webinar-participant-data-is-inaccurate/17062/2):
>
> Hello, Any updates/ suggestions regarding this issue? I would like to add that upon further examining the webinars with data issues I observed that only the webinars with occurrence ids with the ‘/’ character in them were the ones that failed to retrieve data. For example - Webinar Id : 316014643 Occurence Ids : /45rrzUAQBukO/9FsKN7Fw== (issue) Vk8kUQ2KSMCCcBWX4E8bbA== DKSyQyVHT/+o8Jo/uReKvQ== UBt3bxVlREiW85DPM3vIHA== Webinar Id - 531155155 Occurence Ids : fngmMZG4SmuCxGUFtWGyaQ== L…

Thanks a lot!  
Priya

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**Author:** ![tommy](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/tommy/32/72769_2.png) [@tommy](https://devforum.zoom.us/u/tommy)\
**Post date:** [May 18, 2020, 7:43pm UTC](https://devforum.zoom.us/t/multiple-occurrence-ids-for-one-webinar-day/16756/4 "2020-05-18T19:43:21Z")

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Hey @priya.jetley,

We will take a look at your other post! 🙂

Thanks,  
Tommy

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**Author:** ![DeveloperBot](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/developerbot/32/12632_2.png) [@DeveloperBot](https://devforum.zoom.us/u/DeveloperBot)\
**Post date:** [August 21, 2020, 9:22pm UTC](https://devforum.zoom.us/t/multiple-occurrence-ids-for-one-webinar-day/16756/5 "2020-08-21T21:22:57Z")

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Closed on August 21, 2020, 9:22pm UTC