Calculator Inputs
Example Data Table
| Target zone | Converted local start | Converted local end | UTC offset | Day relation | Status |
|---|---|---|---|---|---|
| America/New York | 25 Mar 2026 10:00 | 25 Mar 2026 11:00 | -4 | Same day | Ideal |
| Asia/Karachi | 25 Mar 2026 18:00 | 25 Mar 2026 19:00 | +5 | Same day | Acceptable |
| Asia/Tokyo | 25 Mar 2026 23:00 | 26 Mar 2026 00:00 | +9 | Same day | Outside |
| Australia/Sydney | 26 Mar 2026 01:00 | 26 Mar 2026 02:00 | +11 | Next day | Outside |
Formula Used
1. Converted local time
Converted Local Time = Base Meeting DateTime + (Target UTC Offset − Base UTC Offset) ± Daylight Saving Adjustment
2. Converted meeting end
Local End Time = Converted Local Start Time + Meeting Duration
3. Work-hour fit logic
Ideal means the full converted meeting falls inside the chosen work window. Acceptable means it lands near that window. Outside means it sits beyond the comfort range.
4. Weighted overlap score
Overlap Score (%) = ((Ideal Count × 1) + (Acceptable Count × 0.5)) ÷ Total Zones × 100
The page uses timezone database rules through server-side date objects, so seasonal daylight changes are applied automatically for each selected location.
How to Use This Calculator
- Choose the meeting date and the organizer’s start time.
- Enter the meeting duration in minutes.
- Select the base time zone where the meeting is first defined.
- Set the preferred workday start and end time used for fit checks.
- Choose up to six target time zones for teammates or offices.
- Press Convert Meeting Times to show the result above the form.
- Review the summary cards, detailed table, and Plotly chart.
- Download the final report as CSV or PDF when needed.
FAQs
1. What does this calculator do?
It converts one meeting start time into multiple local times, adds the meeting end time, checks work-hour fit, and summarizes global scheduling quality.
2. Does it handle daylight saving time automatically?
Yes. The conversion uses timezone database rules, so seasonal offset changes are applied to the selected date for each location.
3. What is the weighted overlap score?
It is a quick scheduling health score. Ideal windows count fully, acceptable windows count halfway, and outside windows add no positive weight.
4. Why can one zone show next day or previous day?
Large offset differences can move the converted time across midnight. That is why the day relation field helps identify calendar shifts instantly.
5. Can I compare several offices at once?
Yes. You can evaluate up to six target zones in one run, which is useful for distributed teams, client calls, and regional coordination.
6. What does Ideal, Acceptable, and Outside mean?
Ideal means the meeting fits fully inside the work window. Acceptable means it is close. Outside means it lands clearly outside the preferred range.
7. What is included in the CSV export?
The CSV includes the base schedule, each target time zone, converted local start and end times, UTC offset, day relation, work-hour status, and duration.
8. Why use the chart?
The chart gives a fast visual comparison of local start and end hours, making it easier to spot inconvenient times before sending invites.