Timestamp Converter

Convert between Unix timestamps, human-readable dates, and different time formats

Current Time

Unix Timestamp

Human Readable (Local)

UTC Time

Quick Actions

From Timestamp

Unix Timestamp (seconds):

Milliseconds Timestamp:

Converted Results:

Local Time: -

UTC Time: -

ISO 8601: -

RFC 2822: -

Relative: -

From Date

Date:

Time:

Timezone:

Custom Date String:

Supports various formats: YYYY-MM-DD HH:mm:ss, MM/DD/YYYY, etc.

Generated Timestamps:

Unix Timestamp: -

Milliseconds: -

Microseconds: -

Nanoseconds: -

Timezone Converter

Source Time:

Target Timezone:

Converted Time:

Batch Timestamp Converter

Timestamps (one per line):

Enter Unix timestamps, one per line

Converted Results:

Enter timestamps to see conversions

Format Examples

Unix Timestamp: 1609459200

Milliseconds: 1609459200000

ISO 8601: 2021-01-01T00:00:00.000Z

RFC 2822: Fri, 01 Jan 2021 00:00:00 GMT

Human Readable: January 1, 2021 12:00:00 AM

Timestamp Tools

Add/Subtract Time

Result: -

Time Difference

Difference: -

Actions

6. Days Until

What it does: "Days Until" calculates how many days remain until a target date (a birthday, holiday, event). It is essentially a date-difference from today to a future date but often presented with friendly copy and optional recurrence handling for yearly events.

Features

Support recurring yearly events: if the target date this year already passed, compute days until the date next year.

Offer both exact days and a human-friendly format like "2 months and 5 days".

Countdown formatting: allow users to toggle between days-only, weeks + days, or months + days.

Example: Today is 2025-09-24 — Days until 2025-12-25 (Christmas) = 92 days.

Putting it all together — Building reliable web calculators

Here are practical tips for developers and product managers building these tools on websites and mobile apps:

Use tested date libraries. Rely on battle-tested libraries (like Luxon, date-fns, or the native Intl APIs) rather than hand-rolled date math. They handle leap years, daylight saving time, and locale formats.

Validate user input. Provide clear error messages, accept multiple formats, and sanitize all numeric input to avoid parsing errors (commas vs dots in decimals).

Provide educational context. For BMI and loan calculators, include short notes about limitations (BMI) and fees/assumptions (loans) so users understand what the outputs mean.

Accessibility. Make forms keyboard-friendly, support screen readers, and provide visible focus states. Add aria-live regions to announce results to screen reader users.

Performance and privacy. Calculations should occur client-side where possible to reduce latency and avoid storing sensitive input like birth dates or financial figures on servers unless explicitly needed.

Internationalization (i18n). Respect local number and date formats, offer metric and imperial units, and translate messages for broader reach.

Sample HTML form (simplified)

<form id="percentage-form"> <label>Base: <input name="base" type="number" step="any" /></label> <label>Percentage: <input name="percent" type="number" step="any" /></label> <button type="submit">Calculate</button> </form>

Attach client-side JS to compute results instantly and show them inside an accessible result container.

Design & SEO considerations

These calculator pages are highly searchable. Follow these quick SEO tips:

Provide clear titles and meta descriptions (as used in this page).

Use structured data (Schema.org) where appropriate — for example, FAQ schema if you include common questions about the calculators.

Offer shareable results or a printable summary for users who want to save calculations or share with advisors.

Include internal links between calculators (users often transit between percentage calculators, loan calculators and BMI pages).

Conclusion

Age, Percentage, Loan, BMI, Date Difference, and Days Until calculators are simple but powerful tools that deliver immediate value. When implemented carefully — with correct formulas, clear UX, accessibility, and privacy considerations — they can significantly improve user engagement and trust. Developers should prefer reliable libraries for date and numeric handling, clearly document assumptions, and provide helpful explanations so users can understand and act on their results.

If you’d like, I can also provide ready-to-use JavaScript snippets for any of the calculators above (for example, a full amortization table script for the Loan Calculator or a BMI widget with unit toggles). Tell me which one you want first and I’ll include a copy-pasteable implementation.

Timestamp Converter

Current Time

Quick Actions

From Timestamp

Converted Results:

From Date

Generated Timestamps:

Timezone Converter

Batch Timestamp Converter

Format Examples

Timestamp Tools

Add/Subtract Time

Time Difference

Actions

Example algorithm (days)

6. Days Until

Features

Putting it all together — Building reliable web calculators

Sample HTML form (simplified)

Design & SEO considerations

Conclusion