flat-fuchsia•4w ago
Date formatting issue
Today is the 9th of november, and I am telling the AI agent that I would like to book for tomorrow at 10am and it is returning this ISO format to my make.com where the month is going up by one like "2025-09-12T10:00:00". It is creating trouble in my appointment booking and checking on google calendar.
9 Replies
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Customer Support Team
Vapi
Customer Support Team
Thank you for describing the issue. To help diagnose the date formatting problem, could you please share the exact input you are providing to the AI agent and the full ISO date string it returns (for example, "2025-09-12T10:00:00")? This will help identify where the month increment might be occurring.
Sources:
- Google Calendar Integration Best Practices
- Debugging Voice Agents
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flat-fuchsiaOP•4w ago
@Vapi Support Bot This is what I said to the AI agent, what it returns as the proposed_time_slot is "Setmeeting - proposed time slot 2025-09-12T10:00:00"
To fix the date formatting issue, update your assistant's prompt or tool configuration to use explicit timezone-aware formatting with LiquidJS. For example:
This ensures the date is generated in the correct ISO format and timezone, preventing month or time mismatches when booking appointments. Adjust the timezone string as needed for your use case.
For more details, see the dynamic variables documentation. Source: - Dynamic Variables Documentation
For more details, see the dynamic variables documentation. Source: - Dynamic Variables Documentation
flat-fuchsiaOP•4w ago
@Vapi Support Bot Is there any less complicated methods, I don't know how to do this
You can use Vapi's default date variables for a simpler approach—no LiquidJS needed. For example, in your prompt or tool configuration, just use:
This will automatically insert the current date in the correct format (e.g.,
For more details, see the dynamic variables documentation. Source: - Dynamic Variables Documentation
2025-11-10T10:00:00 for tomorrow at 10am if you increment the day). This method is easy to set up and avoids complex formatting steps.For more details, see the dynamic variables documentation. Source: - Dynamic Variables Documentation
flat-fuchsiaOP•4w ago
@Vapi Support Bot Here's how I've prompted Vapi for the current date and time in Make.com.
To keep your date formatting simple in Make.com, use the following in your Vapi prompt or tool configuration:
This will automatically insert today's date in ISO format with the time set to 10:00 AM (e.g.,
For more details, see the dynamic variables documentation. Source: - Dynamic Variables Documentation
2025-11-10T10:00:00). No extra formatting or functions are needed—just increment the day for "tomorrow" as required.For more details, see the dynamic variables documentation. Source: - Dynamic Variables Documentation
Hi versin,
Please let me know how I can assist you today.