Start with the job in front of you
A date calculation can be off by a day simply because the start date is included in one system and excluded in another. Time zones and date formats add another quiet source of mistakes.
A short test is usually faster than trying to fix a large final file after the fact. Keep the original nearby, name the exported version clearly, and change one setting at a time when the result matters.
Use a small, repeatable routine
Write down the start date, end date, whether the endpoints are inclusive, and the time zone if it matters. Test the method with a known short interval before relying on a long one.
The useful part of a browser tool is not simply getting an output. It is being able to reproduce the same result tomorrow, explain what changed, and notice when an input or assumption has changed.
Do one last check before sharing
For contracts, travel, medical care, or legal deadlines, confirm the relevant rule with the responsible organization or a qualified professional.
If the result will be published, sent to a client, or used to make a decision, compare it with the source rather than trusting a filename or a successful download message.
Practical checklist
- Keep the original input until the output is checked.
- Test the workflow on a small sample first.
- Use clear names for exported versions.
- Review the result in the app where it will actually be used.
- Record important settings or assumptions.