Time

Convert durations between seconds, minutes, hours, days, weeks, months, and years. Built-in formulas, runs locally in your browser.

Conversions

Output

1000

Millisecond

1 Second → Millisecond

How was your conversion?

Time rating: 4.8 / 5.0 (25 reviews)

About Time Converter

Time Converter swaps durations between seconds, minutes, hours, days, weeks, months (30.44 days average), and years (365.25 days including leap years). Useful for working out monthly subscription costs as hourly rates, planning deliveries across days and weeks, converting timestamps in code (Unix epoch is in seconds, but clocks report hh:mm:ss), and translating '6 months' into weeks for project planning. The conversion uses the standard fixed conversions except months and years, which use the international averages. Runs locally; nothing is uploaded.

Best for

  • Translating Unix timestamps (seconds since 1970) into human-readable durations
  • Working out a monthly subscription rate as an hourly cost
  • Project planning where '6 months' needs to be weeks or days

Pros

  • +Seconds ⇄ minutes ⇄ hours ⇄ days ⇄ weeks ⇄ months ⇄ years in one panel
  • +Months use 30.44-day average; years use 365.25 for leap inclusion
  • +Local JavaScript only; no signup, no uploads, works offline

Cons

  • −Months and years are calendar averages; specific calendar months vary
  • −No timezone-aware conversion (those are wall-clock, not durations)

How to use Time Converter

  1. 1

    Enter the source value, color code, or parameters in the input fields.

  2. 2

    Select the source and destination units or models from the option dropdowns.

  3. 3

    Watch the output update instantly in real-time as you type or adjust.

  4. 4

    Copy the converted results to your clipboard with a single click.

Frequently Asked Questions

Why is a month defined as 30.44 days?
30.44 days is the average across all 12 calendar months of a leap-cycle year (365.25 ÷ 12). It's the international standard for time math where the specific calendar month is unknown; if you know the exact month (e.g. February) use a calendar calculator.
Why is a year 365.25 days?
365.25 days is the average leap-cycle year (365 × 3 + 366 ÷ 4). It's the standard for converting 'years' to seconds without getting tripped by leap years — better than assuming 365 plain days.
Can I convert Unix timestamps (seconds since 1970)?
The duration converter works on durations, not absolute moments. To convert a Unix timestamp to a date/time, use the date picker elsewhere. For a Unix timestamp in seconds → duration in years, this tool works.
Do you handle milliseconds and microseconds?
Yes — switch the input unit to milliseconds and read off seconds, days, etc. Sub-second values use scientific notation when below 0.001 second.
Are my duration inputs uploaded?
No. The conversion is fully local JavaScript. Your inputs for project planning, billing, etc. never leave your device.

Related tools

FREE

100% Free

No hidden fees, no subscriptions, and no limits. Enjoy complete access to all features gratis.

SIGNUP

No Signup Required

Start converting immediately without creating an account or sharing email address.

PRIVACY

Private & Secure

Your files never leave your device. All processing is completed locally for maximum privacy.

BATCH

Batch Conversion

Convert multiple files simultaneously to save time. Fast and efficient multi-file queue.

LOCAL

Runs in Browser

Utilizes advanced client-side WebAssembly technology to process files directly inside your tab.

FORMATS

200+ Formats

Supports a wide variety of formats including images, documents, audio, video, and more.

USER REVIEWS

Time Quality Rating

4.8
25 reviews

How was your experience? You need to convert and download at least one file to provide feedback!