Hey ​@C-B_2021,

This is probably due to time zone issues. You might want to check out Kouvonne’s answer in this other similar post.

Mike, Consultant @ Automatic Nation

​@C-B_2021 

This is a bit outdated because the date/time fields have recently changed in Airtable, but my sample time zone base & YouTube video might help you get a better understanding of the nonstandard ways that Airtable handles time zones, and how you can use offsets to get the times you’re looking for: Time Zones: Working with multiple different time zones in Airtable

Hope this helps!

If you have a budget and you’d like to hire the best Airtable consultant to help you with this or anything else that is Airtable-related, please feel free to contact me through my website: Airtable consultant — ScottWorld

Does this look right?

If so, I’ve pasted the code below.  I forced the date creation to be UTC, set it to 2am UTC which is 10am Perth, and then added an offset at the end.  There’s probably a more elegant way to do it but this seems to work fine

// Floor Plan Auto Scheduler Script
// Schedules 1-hour consecutive time slots starting from 10:00am on booking day

const table = base.getTable("Main Database");
const recordId = input.config().recordId;

// Safety check
if (!recordId) {
    throw new Error("No recordId provided from automation.");
}

// Fetch current record
const record = await table.selectRecordAsync(recordId);
if (!record) throw new Error("Record not found.");

// Booking Date
const bookingDateRaw = record.getCellValue("Booking Date");
if (!bookingDateRaw) throw new Error("Booking Date is empty. Script exiting.");

const bookingDate = new Date(bookingDateRaw);

// Skip weekends: push to Monday if Saturday or Sunday
const day = bookingDate.getDay();
if (day === 6) bookingDate.setDate(bookingDate.getDate() + 2); // Saturday → Monday
else if (day === 0) bookingDate.setDate(bookingDate.getDate() + 1); // Sunday → Monday

// Base slot = 10:00am on the adjusted date
const baseSlot = new Date(Date.UTC(
    bookingDate.getFullYear(),
    bookingDate.getMonth(),
    bookingDate.getDate(),
    2, 0, 0  // 2am UTC = 10am Perth
));

// Fetch all records
const allRecords = await table.selectRecordsAsync({ fields: ["Booking Date", "Product Type (from Link to Product Database)"] });

// Filter for same-day Floor Plan records (excluding current one)
const sameDayRecords = allRecords.records.filter(r => {
    if (r.id === recordId) return false;

    const rDate = r.getCellValue("Booking Date");
    const productTypes = r.getCellValue("Product Type (from Link to Product Database)");

    if (!rDate || !productTypes) return false;

    const rd = new Date(rDate);
    const isSameDay =
        rd.getFullYear() === bookingDate.getFullYear() &&
        rd.getMonth() === bookingDate.getMonth() &&
        rd.getDate() === bookingDate.getDate();

    const isFloorPlan = productTypes.includes("Floor Plan");

    return isSameDay && isFloorPlan;
});

// Calculate next available slot
const slotIndex = sameDayRecords.length;
const assignedSlot = new Date(baseSlot.getTime() + slotIndex * 60 * 60 * 1000);


// Write back the time slot to current record
await table.updateRecordAsync(recordId, {
    "Time Slot (Start)": assignedSlot
});