Our standards

Editorial policy

A tools site is only worth using if its numbers are right. This page sets out exactly how the calculators, converters, and guides on 24hourto12hour.com are written, reviewed, verified, and corrected — so you can trust what you read here, and hold us to it.

What we hold ourselves to

Accuracy first Every calculation is verified before it ships, and the method is shown openly on the page so you can check it yourself.
Transparency Real named authorship, visible standards and sources, and clear “last reviewed” dates on every page.
Independence No one can pay to change a result, feature a tool, or influence a review. The math is the math.
Corrections welcomed If a result is wrong, we want to know. Reports are prioritised, fixed, and the update is dated.

Who writes and reviews our content

Every tool, chart, and guide on this site is written and reviewed by Fletcher Langley, a time and scheduling specialist with 14+ years in shift operations and payroll systems and a BS in Industrial Engineering. Content is produced by someone who has actually had to defend a timesheet, reconcile an overnight shift, and explain why 8 hours 30 minutes is not 8.30 decimal hours — not by an anonymous content team.

Each page carries a visible byline and a “last reviewed” date, and links to the author’s full profile so you can see the experience behind it. Where a page is written by a contributor in future, it will always be reviewed and approved by a subject-matter specialist before publication, and both roles will be named.

How we make sure a tool is correct

Every calculator goes through the same checks before it goes live — and again whenever it changes.

  1. Define the method in plain terms.Before any code, we write down exactly how the result should be calculated (for example, converting times to minutes past midnight), and which format standard applies.
  2. Show the working on the page.The formula and a worked example are published on the tool itself, so the logic is never a black box you have to trust blindly.
  3. Verify every example by hand.The worked examples and the examples table are checked independently — by hand and with separate calculations — not just assumed from the code.
  4. Test the edge cases.Overnight and multi-day spans, negative or impossible inputs, midnight and noon boundaries, and empty fields are all checked to behave sensibly, not to produce a wrong number or an error.
  5. Human expert review before publishing.No tool or guide is published until it has been reviewed and approved by our specialist. We use software to help draft and format pages, but every calculation, example, and factual claim is checked and signed off by a person before it goes live.
  6. Re-check on every change.If a tool or its content is updated, it goes through the same verification again, and the “last reviewed” date is updated.

Standards and sources we follow

Where a recognised standard governs a format or conversion, we follow it and cite it on the relevant page. The main authorities behind the tools on this site are:

  • ISO 8601 — the international standard for the 24-hour clock and date/time representation.
  • IANA Time Zone Database — the reference for time zones and daylight-saving rules.
  • SI units (BIPM / NIST) — the definitions behind time-unit conversions such as seconds, minutes, hours, and days.
  • POSIX / IEEE Std 1003.1 — the basis for Unix and epoch timestamp tools.
  • US DoD / NATO 24-hour convention — for military time notation.

Where a tool is simple, well-established arithmetic with no single governing standard, we say so plainly rather than dressing it up with a hollow “verified against” badge. In those cases the guarantee is our published method and our hand-checked examples.

Corrections & updates

We would genuinely rather hear that something is wrong than have it stay wrong. If a tool returns a result you believe is incorrect, tell us the tool name and the exact values you entered through the contact page, and we will reproduce it against the method shown on that page.

Confirmed errors are treated as a priority. When we fix one, we update the tool, verify it again, and update the page’s “last reviewed” date so the change is visible. Substantive changes to how a tool works are noted on the page rather than made silently.

Independence, funding & advertising

24hourto12hour.com is an independent site, and the tools are free to use. Our results and recommendations are never influenced by payment: no one can pay to feature a tool, change a calculation, or alter a review.

If the site displays advertising or uses affiliate links, they will be clearly distinguishable from the tools and their outputs, and they will never affect the numbers a tool produces or which tools we choose to build. [Site owner: update this paragraph to match how the site is actually funded — for example, “This site is supported by display advertising” or “This site currently runs no ads” — so it stays accurate.]

What our tools are — and aren’t

The calculators and converters here are planning and verification aids. They are accurate for the arithmetic they perform, but they are not a substitute for your employer’s payroll system, your official roster, or professional advice. For how a result applies to your specific pay, contract, or legal situation, check with the relevant professional or your own system of record. Nothing on this site is payroll, legal, or financial advice.

Questions about our standards?

If anything here is unclear, or you want to raise an editorial concern, reach us through the contact page or find the author on X. You can also read more about the site on the about page.

Last reviewed: August 2026.