GoHighLevel Timezone API Setup & Integration Guide 2026

GoHighLevel timezone API automatically manage appointment scheduling in various time zones. If you include calendars or booking systems, the timezone API will make sure that appointments are shown correctly for you and your contacts, no matter where they are.

Timezone detection is a key feature for most common integrations, such as Google Calendar, Outlook Calendar, and custom API implementations, to avoid booking conflicts and missed appointments.

Ever had a client make an appointment at 3 PM their time, but you thought it was 3 PM your time? That confusion costs businesses thousands in missed meetings every year.

GoHighLevel addresses this issue with timezone APIs that automatically identify, convert, and display times accurately for all parties.

This guide will cover how the timezone API works, how to properly configure it, and common timezone problems that can cause appointment scheduling to fail.

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What is Timezone API?

A timezone API is a programmatic interface that allows you to determine the user’s timezone and automatically convert times between different timezones.

When a person schedules an appointment on your GoHighLevel calendar, a few things occur in the background:

The API identifies the visitor’s timezone (from their device or IP address)
It shows them available times in their local timezone
When they book, it changes that time to your time zone
Both of you get confirmations indicating the proper time for each of your locations.
If you didn’t have the timezone handling, you would see “3 PM,” and they would see “3 PM” but you would be talking about two entirely different times.

How GoHighLevel processes timezones?

Before Jumping into API guide, it is important to understand that how High Level processes timezones? GoHighLevel has timezone support built in, and it’s available for multiple features. Explore the details below:

Calendar Booking System
Calendar Integration in GHL (Google and Outlook)
Workflow and Automation Timezones

Calendar Booking System

The timezone is set in the calendar settings when creating a calendar in GoHighLevel. This will be the “home timezone” for this calendar.

GoHighLevel automatically identifies the timezone of visitors to your booking page. Available time slots convert to show in their timezone. If you’re available 9 AM to 5 PM EST, someone in PST sees 6 AM to 2 PM PST. If they schedule a 10 AM PST, it will be saved as 1 PM EST in your calendar. The confirmation emails display the correct time for each person’s timezone.

For more information about the HighLevel Timezone API. You can access the complete API documentation, endpoints, and implementation guide through the provided link.

Calendar Integration in GHL (Google and Outlook)

GoHighLevel syncs your existing appointments
It reads the timezone information from your calendar service
New bookings will automatically be added to your external calendar with the correct timezone when they are booked through GoHighLevel.
Changes in either system update the other with accurate times
Times are always correct when integrated with the external calendar, which respects the timezone settings.

Workflow and Automation Timezones

Timezones are also respected in GoHighLevel workflows:

SMS and emails are sent to remind the appointment based on the contact’s timezone.
Scheduled messages deliver at the correct local time
Wait steps in workflows take into account timezone differences
Example: If you set a reminder to send “2 hours before appointment”, it will work out correctly even if there is a time zone difference.

How to Set up timezone in GoHighLevel?

Most scheduling problems are avoided by proper timezone configuration. Here is the complete guide of setting up timezones in GHL. Each type of setup is explained so please read it carefully thanks.

Set Your Account Timezone

Click on Settings Tab in GoHighLevel.
Click on Business Profile or Account Settings.
Click on the Timezone dropdown.
Choose your timezone (e.g., America/New York for Eastern Time).
Save changes.
Hurray! Your timezone settings are done and saved. This timezone setting will be used for all your accounts and will impact the time shown in your dashboard.

Read this: How to Send an API POST Request in GoHighLevel Without Using Inbound Webhooks

Set Individual Calendar Timezones

If you are running in multiple locations, each calendar can have its own timezone.

Go to Calendars
Open the calendar you wish to set up.
Click on Settings or the gear icon
Look for the timezone setting
Select the appropriate timezone for that calendar and save
This type of timezone setting can be used when team members are located in various timezones or multiple offices.

Set Contact Timezone

Each contact can have individual timezone information stored in GoHighLevel.
Typically, they will be able to determine the timezone from a form they fill out on your site, an appointment they make, or a link in your email.

You can also manually set a contact’s timezone:

Click on the contact record
Click the Timezone field
From the dropdown, choose their timezone
Then save
This will make sure that all future communications and bookings are in their proper time zone.

Gohighlevel Timezone API Setup Guide

Here’s the current setup process as of 2026, GHL has fully moved to API v2; V1 APIs reached end-of-support on December 31, 2025, and the ability to generate new API keys is being removed from Agency and Sub-account settings going forward. So you’re choosing between two v2 auth methods depending on what you’re building.

Step 1: Pick your auth method

Private Integration Token use this if you’re building something internal, for one sub-account only.

Generated directly in Agency or Sub-account settings
You can scope it (e.g., contacts read-only)
No OAuth handshake needed — simplest path

OAuth 2.0 (Marketplace App) use this if your tool needs to work across multiple sub-accounts or you’re building something for the GHL Marketplace/community.

Requires registering an app in the Developer Marketplace to get a Client ID and Client Secret
Store your Client Secret securely immediately since it won’t be displayed again Expert GHL Developer

Step 2: For Private Integration Token

Log into GHL, Settings (bottom left).
Go to the Private Integrations API Key section (note: generating API keys requires a Pro plan or above) SupplyGem.
Set the scopes you need (contacts.readonly, calendars.write, opportunities.readonly, etc.), follow least-privilege and only request what your integration actually needs Expert GHL Developer.
Copy and store the token securely (env variable or vault, never client-side code)

Step 3: For OAuth 2.0 / Marketplace App

Create a developer account at the HighLevel Marketplace
Click “Create App,” fill out your developer profile
Configure your OAuth scopes — these act as permission slips for your integration Expert GHL Developer
Run the OAuth handshake to get short-term access tokens (no more permanent keys — tokens are now short-term and require periodic re-authentication for security) Expert GHL Developer
Test the connection with a simple GET request before building further

Step 4: Know your limits

Rate limits are 100 requests per 10 seconds burst, and 200,000 requests per day per Marketplace app per resource (location or company). Build with that ceiling in mind if you’re doing bulk syncs.

Common Problems and Solutions of Timezones

Many users may see appointments at the wrong time when using the calendar.

Problem 1:

Contact Receives Confirmation at Wrong Time
The client books at 2 PM and the confirmation email is sent at 5 PM.

Cause: The timezone of the contact is not detected or set.

Solution of Problem 1:

Open the contact record
Check the timezone field
If blank or wrong, manually set it
Resend confirmation email
If you book again, make sure that your booking page has timezone detection turned on.

Problem 2:

Calendar displays the incorrect time for appointments
Bookings are not appearing in your Google Calendar or Outlook for 1-3 hours.

Cause: Timezone mismatch between GoHighLevel and your external calendar.

Solution of Problem 2:

Ensure that your GoHighLevel account’s timezone is set properly (Settings, Business Profile).
Make sure that your Google/Outlook calendar timezone is correct.
Be sure both are in the same timezone.
Disconnect and reconnect Calendar integration
Test with a new booking

Problem 3:

Booking page shows times in the wrong time zone
Visitor in California sees times in Eastern timezone instead of Pacific.

Cause: The time zone detection is disabled or not working.

Solution of Problem 3:

Click on Calendar Settings
Click on the Timezone Detection option.
Allow “Automatically detect visitor timezone”
Save and test from various locations or VPN.
If it still doesn’t work, check to see if JavaScript is disabled on the booking page.

Problem 4:

DST (Daylight Saving Time) causes problems
Time is not accurate when daylight saving time changes.

Cause: Daylight saving time (DST) is not functioning properly.

Solution of Problem 4:

Avoid using generic timezone names like “GMT-5”.
Example: America/New York instead of EST
These named timezones will automatically adjust for DST.
Update all Calendar and Account timezones:
Existing appointments may need to be manually reviewed during DST transition.

Problem 5:

Reminder is sent at the wrong time
The appointment is at 3 PM, reminder is at 9 AM (2 hours prior).

Cause: The Workflow time zone is incorrect.

Solution of Problem 5:

Open the workflow
Check the wait/delay step before the reminder
Make sure that it is using “appointment timezone” and not “account timezone”
To update and save the workflow
Test with a sample appointment

Best Practices for Timezone Management

Here are the best practices that we use in our regular routines to manage timezones.

Named Timezones, Not Offsets

Good: Europe/London, Asia/Beijing, America/New York
Bad: GMT-5, UTC+8

Timezones are automatically adjusted for daylight saving time. Offset-based timezones don’t.
Always set the Account and Calendar Timezones

Please do not leave the timezone as default or blank. If you think that the system has correctly identified them, you can still explicitly set them.

Test Bookings from Different Timezones

Test your booking page with a VPN or by having team members in other time zones test it.
Check that times are displayed properly for the visitor
Confirm emails mean that it’s the right time for both parties
Confirm appointments are displayed in your calendar

Save Your Timezone Configuration

Maintain a simple document that contains your account timezone setting, each calendar’s timezone, how reminders are set, and any custom timezone logic in workflows. This can be helpful for troubleshooting and training new team members.
Make sure appointments are still scheduled at the appropriate time.
Verify reminders are sending at expected times
Test a new booking to determine if it can still be detected.

Set Unknown Contacts Fallback Timezone

In workflows and automation, always use a default timezone if you don’t know the contact timezone.
Use your business timezone as default
Or use the most widely used timezone for your customers.

This was it! From settings to problems and their solutions, I have explained everything about the Timezone API and their respective stuff in depth. If you still face anykind of issue while setting up timezones, Book a free consultation with us!

What timezone format does GoHighLevel use?

GoHighLevel uses IANA timezone database identifiers (like America/New York, Europe/London). These are the default time zone names that most systems use and they take care of DST.

How can I test timezone settings without actual appointments?

Schedule test appointments in contact records with various time zone options. Browser developer tools can also be used to set the system timezone and test the booking page, or a VPN can be used to emulate access from other locations.

Do SMS and email reminders take into account the time zone?

Yes, provided that the workflow is set up properly. Ensure that reminder timing is based on “appointment timezone” or “contact timezone” instead of a fixed timezone. This will make sure that reminders are sent at the right time in the recipient’s local time zone.

What is different about what happens during daylight saving time?

If you use named timezones (America/New York), HighLevel automatically adjusts for DST. Appointments set for “2 PM” will still be at 2 PM local time after the DST change. Times will not adjust if you are using offset-based timezones (GMT-5), and may be one hour off.

Why does my calendar show times in military format?

This is a display setting that is independent of timezone. Review your account preferences for date/time format. You can usually toggle between 12-hour (2:00 PM) and 24-hour (14:00) formats.

Are there available times for contacts in their preferred time zone?

Yes, that’s the default behavior. If timezone detection is turned on, visitors will automatically see times in their local timezone. If the timezone is not detected, they can also manually change it via a drop-down on most booking pages.