# Contacts with missing time zones

**URL:** <https://community.hubspot.com/t/contacts-with-missing-time-zones/117651>\
**Category:** CRM\
**Tags:** contacts\
**Created:** [October 3, 2024, 9:57pm UTC](https://community.hubspot.com/t/contacts-with-missing-time-zones/117651 "2024-10-03T21:57:06Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![SmartListGhost](https://avatars.discourse-cdn.com/v4/letter/s/bbe5ce/32.png) [@SmartListGhost](https://community.hubspot.com/u/SmartListGhost)\
**Post date:** [October 3, 2024, 9:57pm UTC](https://community.hubspot.com/t/contacts-with-missing-time-zones/117651/1 "2024-10-03T21:57:06Z")

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Is there a way to mass fix contacts who have missing time zones? I have a client who wants to do localized time sends but like 65% of their database is missing time zones.

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**Author:** ![JWingate2](https://d10pqhm3lwygmk.cloudfront.net/user_avatar/community.hubspot.com/jwingate2/32/37981_2.png) [@JWingate2](https://community.hubspot.com/u/JWingate2)\
**Post date:** [October 3, 2024, 10:01pm UTC](https://community.hubspot.com/t/contacts-with-missing-time-zones/117651/2 "2024-10-03T22:01:43Z")

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Hi @SmartListGhost ,

If you have their State/Region property known, you could use branching logic and use the state/region within that timezone to update their timezones.  
I would enroll anyone with State/Region Known and Timezone is unknown.  
Let me know if you need more details.

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**Author:** ![SmartListGhost](https://avatars.discourse-cdn.com/v4/letter/s/bbe5ce/32.png) [@SmartListGhost](https://community.hubspot.com/u/SmartListGhost)\
**Post date:** [October 3, 2024, 10:18pm UTC](https://community.hubspot.com/t/contacts-with-missing-time-zones/117651/3 "2024-10-03T22:18:17Z")

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Ah yes, that makes sense!

Thank you @JWingate2 !!

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**Author:** ![HFisher7](https://d10pqhm3lwygmk.cloudfront.net/user_avatar/community.hubspot.com/hfisher7/32/101931_2.png) [@HFisher7](https://community.hubspot.com/u/HFisher7)\
**Post date:** [October 7, 2024, 10:48am UTC](https://community.hubspot.com/t/contacts-with-missing-time-zones/117651/4 "2024-10-07T10:48:37Z")

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@SmartListGhost Just an FYI that the native ‘HubSpot schedule emails based on time-zone’ sends based on [IP timezone](https://knowledge.hubspot.com/marketing-email/schedule-emails-based-on-recipient-time-zones#:~:text=The%20email%20will%20be%20sent%20in%20batches%20based%20on%C2%A0your%20recipients%27%C2%A0IP%20time%20zone%20property%C2%A0contact%20property%20value.), which is a read-only property and can not be updated in a workflow unfortunately:

 ![HFisher7_0-1728298037644.png](https://d2qpr2jzcazej7.cloudfront.net/original/3X/c/0/c00c489a55dc335d8835ed9f3738fccccc7c899f.png)