Free Productivity Tools: Convert Time, Timestamps and Units in Your Browser

Productivity work often comes down to small conversions: working out what time a meeting falls in another time zone, turning a Unix timestamp into a readable date, or converting a measurement from one unit to another. This guide covers Time Zone Converter, Timestamp Converter and Unit Converter.

All three tools covered in this guide are free with no sign-up, and they run in your browser. Each tool page shows its own steps, and this guide brings those steps together so you can pick the right tool for the job.

Tools in this guide

• Time Zone Converter – convert a date and time between time zones.
• Timestamp Converter – convert Unix timestamps to readable dates and back, in UTC and local time.
• Unit Converter – convert length, weight, temperature, area, volume, speed and data storage units.

Related tool: Password Generator – generate a strong random password. It is covered in the Free Developer Tools guide.

Time Zone Converter

Time Zone Converter converts a date and time between time zones, including UTC, Asia/Karachi, America/New_York and Europe/London. It covers 15 commonly used time zones worldwide, handles daylight-saving transitions automatically, uses the browser’s built-in time zone database, and runs entirely in your browser.

How to use it:

1. Pick a date and time.
2. Choose the source and target time zones.
3. Click Convert to see the result.

Use this tool when you need to schedule or coordinate across time zones, for example working out what time a meeting falls in another city.

Timestamp Converter

Timestamp Converter converts Unix timestamps to readable dates and back, in UTC and local time, in seconds or milliseconds. It handles invalid input gracefully and shows both UTC and local time.

How to use it:

1. To convert a timestamp to a date: enter the number, choose seconds or milliseconds, and click Convert.
2. To convert a date to a timestamp: pick a date and time, and click Convert.
3. Copy either result with the Copy buttons.

Use this tool when you have a timestamp from a log or an application and want to read it as a date, or when you need a timestamp value for a chosen date and time.

Unit Converter

Unit Converter converts length, weight, temperature, area, volume, speed and data storage units. It uses accurate conversion formulas, including proper temperature math, gives instant results as you type with no page reload, and runs entirely in your browser.

How to use it:

1. Choose a category.
2. Enter a value and pick the From and To units.
3. The result updates instantly.

Use this tool when you need to convert a measurement, a temperature or a data size from one unit to another.

Which tool should you use?

• To convert a time between time zones: Time Zone Converter.
• To turn a Unix timestamp into a readable date, or a date into a Unix timestamp: Timestamp Converter.
• To convert a measurement between units: Unit Converter.

The tools also work in sequence: convert a time between time zones with Time Zone Converter, then turn that moment into a Unix timestamp with Timestamp Converter if a system needs the value in that form.

Practical tips

• Daylight-saving changes mean the same conversion can differ by an hour depending on the date; double-check the target time zone’s current offset if scheduling far in advance.
• UTC is a good common reference point for international teams.
• A time zone not in the list can be reached by converting via UTC as an intermediate step.
• Unix timestamps in seconds are 10 digits; in milliseconds they are 13 digits – check the unit dropdown.
• The date-to-timestamp conversion uses the browser’s local timezone; use the UTC value when comparing timestamps across different timezones.
• Switching the category resets the unit list to that category’s units.
• Temperature conversion uses proper formulas, not simple multipliers.
• In Unit Converter, results update live – no need to click a button for most conversions.
• Conversions use standard, accurate formulas, but always verify figures for critical or scientific work.

Limitations to keep in mind

• Time Zone Converter covers 15 commonly used time zones; a time zone outside the list needs a conversion via UTC as an intermediate step.
• The date-to-timestamp conversion uses the browser’s local timezone, so the result depends on the browser’s local setting.
• Unit Converter covers metric and imperial/US units across its seven categories; verify figures for critical or scientific work.
• Password Generator is mentioned only as a related tool in this guide; it is covered in the Free Developer Tools guide.
• Daylight-saving transitions mean the same conversion can differ by an hour depending on the date.

FAQs