Does Daily Report Time Calculator upload my data?

Runs locally in your browser. No data is uploaded.

How do I use Daily Report Time Calculator?

1. Add tasks with labels and minutes. 2. Set transit minutes (optional). 3. Use Forward to compute an end time from a start time. 4. Use Backward to compute a required start time from an end time. 5. Copy the summary if you want to paste it into your report.

What are common mistakes with Daily Report Time Calculator?

Invalid times must be in HH:MM (e.g., 09:00). Times wrap around midnight (00:00 to 23:59).

Back

Backward Time Calculator

Calculate required start time from a fixed end time minus task and transit minutes. Plan backward for daily reports with this free online tool.

What Is Backward Time Calculation?

Backward time calculation determines the required start time given a fixed end time minus the total duration of all tasks and transit. It answers: "If I need to finish by a certain time, when should I start?"

Example

End time: 18:00

Tasks: 120 min + 60 min

Transit: 30 min

Total duration: 210 min (3h 30m)

Required start = 18:00 − 3h 30m = 14:30

When to Use It

Use backward calculation when you have a fixed deadline or end time and need to determine the latest start time. Ideal for daily reports, meeting prep, and ensuring on-time delivery.

Try Forward (start → end) instead Open the Calculator →

Daily Report Time Calculator: Guide

Intent: Sum multiple tasks (in minutes) plus transit time, then calculate an end time (forward) or required start time (backward).
What it does: Adds task durations and transit minutes to produce a total time, then computes either end time from a start time, or required start time from an end time.
Key features: Forward (start -> end), Backward (end -> start), Multiple tasks list, Copy summary
Privacy: Runs locally in your browser. No data is uploaded.
Best for: Daily reports (日報) when you need total time and start/end times quickly
Planning when to start to finish by a fixed end time
Summing multiple work items without a spreadsheet
Why this tool: Fast dynamic task list with a clear total
Forward/backward time calculation in one place
Copyable summary for pasting into a report