# List item expression how it works?

**URL:** <https://forum.bubble.io/t/list-item-expression-how-it-works/98554>\
**Category:** Need help\
**Created:** [June 23, 2020, 7:25pm UTC](https://forum.bubble.io/t/list-item-expression-how-it-works/98554 "2020-06-23T19:25:47Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![jboc](https://avatars.discourse-cdn.com/v4/letter/j/ed8c4c/32.png) [@jboc](https://forum.bubble.io/u/jboc)\
**Post date:** [June 23, 2020, 7:25pm UTC](https://forum.bubble.io/t/list-item-expression-how-it-works/98554/1 "2020-06-23T19:25:47Z")

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Hello,

I’ve connected my app to Google Calendar API using Bubble API Connector, I’m able to retrieve this kind of data :

 ![image](https://us1.discourse-cdn.com/bubble/original/3X/e/f/ef4f6b3998e47c401b6b52fc300cfa87bbb0304e.jpeg)

I want to be able to calculate the time between the start and the end for each event.  
To achieve this I need to retrieve start and end date for each event and do a loop.

 ![image](https://us1.discourse-cdn.com/bubble/original/3X/a/2/a2487a58b0ba3a5e73ef6324312b1b530431c09c.png)

Can you help on how can I get start and end date for each event ?

Kinds regards,

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/bubble/original/3X/2/8/2847faa74692c2ffa5d939d3dc3724cdd060d247.png) [@system](https://forum.bubble.io/u/system)\
**Post date:** [September 1, 2020, 7:25pm UTC](https://forum.bubble.io/t/list-item-expression-how-it-works/98554/2 "2020-09-01T19:25:48Z")

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Closed on September 1, 2020, 7:25pm UTC

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