⏰Free Time & Date Tools Online
Free time and date utilities: Unix timestamp converters, date difference calculators, cron expression builders, and countdown timers. Everything runs in your browser with no signup.
18 free time & date tools below — pick one to get started.
Weather Lookup
Weather Lookup shows the current conditions and a short forecast for any city in the world: temperature and feels-like in Celsius, humidity and cloud cover percentages, wind speed with a 16-point compass direction, today's sunrise and sunset, plus tomorrow's and day 3's date, low-high range, and a short description. Type a city name and click Check Weather. The data comes from the free wttr.in service, fetched directly by your browser with no API key. Because conditions are live third-party data, this tool requires an internet connection, and the city you type is sent to wttr.in as part of the request.
Unix Timestamp Converter
Modern databases, cloud APIs, event logs, and authentication tokens routinely record time as Unix timestamps. While storing timestamps as numeric counts from the Unix epoch simplifies computer sorting and database indexing, these integers are impossible for humans to interpret at a glance. Determining whether a specific ten-digit number represents yesterday, last month, or next year often requires conversion into a human-readable date. This Unix timestamp converter simplifies timestamp-to-date conversion by turning raw epoch values into clear, human-readable dates. You can view converted dates in both UTC and your local system time. Because all conversions run entirely in your browser using client-side JavaScript, your timestamp data never leaves your device and is not transmitted to any server.
Seconds to Time Converter – HH:MM:SS Online
Raw second counts show up everywhere — video durations, server timeouts, API rate limits, workout timers — and mental division by 3,600 gets old fast. Seconds to Time Converter turns any non-negative number of seconds into a readable breakdown of days, hours, minutes, and seconds. Type 90061 and click Convert to get "1 day(s), 1 hour(s), 1 minute(s), 1 second(s)". Fractional seconds are rounded to the nearest whole second. It runs locally in your browser, so the numbers you convert stay on your device.
Time to Decimal Hours Converter – Free Online
Timesheets, payroll systems, and billing tools usually want hours as a decimal — 1:30 becomes 1.5000 — but converting in your head invites rounding mistakes. Time to Decimal Hours Converter accepts a time in HH:MM or HH:MM:SS format and returns the decimal-hour equivalent to four decimal places, so 1:30:00 becomes "1.5000 hours". Input is validated against a strict pattern, and anything that does not look like a clock time gets a clear warning. The math is simple division done locally in your browser.
Hours to Days Converter – Free Online Time Calculator
When a project estimate says 90 hours, what you really want to know is how many workdays that is. Hours to Days Converter divides any hour count into whole days and leftover hours: 90 hours becomes "3 day(s) and 18.00 hour(s)". The day count is the whole number of 24-hour periods, and the remainder keeps two decimals so fractional hours are not lost. One input box, one Convert button, and a plain answer — computed locally in your browser.
Days to Hours Converter – Free Online Time Calculator
Days to Hours Converter does the reverse of its sibling tool: type a number of days and get the equivalent hours with two decimals. Enter 2.5 and click Convert to see "60.00 hours". Fractional days are welcome, so half-days and quarter-days convert cleanly. It is a single multiplication — days times 24 — done locally in your browser with no account and no data leaving the page.
Leap Year Checker Online – Free Calendar Tool
Leap Year Checker tells you whether any year is a leap year, one at a time or in batches. Type years separated by commas or spaces — "2020 2021 2024" works — and click Check to get a verdict per year: "2024: ✓ Leap year" or "2021: ✗ Not a leap year". The rule applied is the standard Gregorian one: divisible by 4, except centuries, unless also divisible by 400 — so 2000 was a leap year and 1900 was not. Batch checking makes it handy for validating date ranges in datasets. Everything runs locally in your browser.
Day of Week Calculator – What Day Was This Date?
Day of Week Calculator tells you which weekday any date falls on. Paste dates one per line or comma-separated — "2024-01-01, 2024-12-25" — and click Find Day of Week to get answers like "2024-01-01: Monday (Mon Jan 01 2024)". It is useful for checking what weekday a birthday, deadline, or historical event landed on, and it handles whole lists in one pass. Dates are parsed by your browser's built-in date handling, so standard formats like YYYY-MM-DD work; anything unparseable is flagged as an invalid date rather than guessed. All processing is local.
Time Between Dates Calculator – Date Difference Tool
Time Between Dates Calculator measures the gap between two dates and expresses it five ways: total days, total hours, total minutes, total seconds, and calendar months. Pick a start and an end with the two date-time pickers and click Calculate Difference — the difference is always taken as an absolute value, so the order does not matter. The months figure is a calendar-month count (year and month fields compared), while the other four are exact elapsed totals. It is useful for project timelines, age-in-days curiosity, and countdown checks. Everything computes locally in your browser.
Discord Timestamp Converter
Discord renders timestamps like `<t:1705320600>` as friendly relative times ("2 hours ago") that automatically adjust to each reader's timezone — far nicer than pasting raw dates into chat. The Discord Timestamp Converter builds these codes two ways: from a Unix timestamp (it auto-detects seconds vs. milliseconds), or from a human-readable date like "2024-01-15 10:30". The output shows the ISO date, a formatted preview, and the ready-to-paste `<t:...>` code. Invalid inputs get a clear error message instead of silent garbage. Everything runs locally in your browser using client-side JavaScript. The tool does not intentionally send your input to our servers.
Cron Expression Parser
Cron expressions are the standard syntax for scheduling recurring background tasks in Unix systems, containers, web servers, and database pipelines. A minor formatting mistake—such as confusing minute and hour positions or misinterpreting step intervals—can cause batch jobs to run continuously or fail silently. Testing schedule expressions directly on production servers risks unexpected system load. This Cron Expression Parser interprets standard 5-field cron strings in your browser, translating each field into straightforward English explanations so you can verify automated schedules before deploying them to production.
Date to Text Converter
Writing out dates in complete formal English is a regular requirement when drafting legal contracts, wedding invitations, certificates, and formal correspondence. The Date to Text converter transforms standard calendar dates into long-form prose with ease. Featuring an intuitive date picker preset to August 26, 2026, the tool formats your selection into a complete sentence-ready string containing the day of the week, month name, calendar day, and full year. Clicking Convert generates clean outputs like Wednesday, August 26, 2026, while unparseable selections display an Invalid date warning. Everything runs locally in your browser using client-side JavaScript. The tool does not intentionally send your selected dates to our servers.
Add or Subtract Days from a Date
Calculating deadlines, warranty periods, project milestones, or travel itineraries often involves shifting a calendar date forward or backward by a specific number of days. The Add/Subtract Days calculator simplifies this arithmetic by combining an interactive date picker with an offset field. By entering a positive number, you add days into the future; by entering a negative number, you subtract days into the past. Clicking Calculate produces the resulting target date in clean ISO format (YYYY-MM-DD), labeled clearly as Result. If an unparseable date is supplied, the tool alerts you with an Invalid date notice. Everything runs locally in your browser using client-side JavaScript. The tool does not intentionally send your dates and day offsets to our servers.
Week Number Calculator
Supply chain managers, agile development teams, and corporate payroll departments frequently track project sprints, shipment windows, and fiscal planning milestones using calendar week numbers. However, standard desktop calendars and mobile date pickers rarely display week numbers prominently, making it awkward to confirm whether a specific delivery date falls in Week 34 or Week 35. Mental calculations are difficult because leap years and varying starting weekdays shift calendar boundaries every year. Week Number provides a simple tool to determine the exact week index for any selected calendar date. Week Number runs locally in your browser using client-side JavaScript. The tool does not intentionally send selected calendar dates to our servers.
Days Until Calculator
Tracking how much time remains before an upcoming holiday, exam, product launch, or vacation is a common daily question. The Days Until calculator determines the exact whole-day difference between any selected calendar date and the current day. Featuring a calendar picker that defaults to December 25, 2026, the tool compares your chosen target against today when you click Count. It provides three clear contextual responses: Today! for matching dates, N days from now for upcoming events, or N days ago for past milestones. If an invalid date is selected, it presents an Invalid date message. Everything runs locally in your browser using client-side JavaScript. The tool does not intentionally send your target calendar dates to our servers.
Timezone Converter
Coordinating calls across regions means doing timezone math in your head — and getting it wrong means missed meetings. This timezone converter translates a time of day between eight major cities: UTC, New York, London, Paris, Los Angeles, Tokyo, Beijing, and Sydney. Pick a time, choose the source and target cities, and click Convert to see the equivalent local time. Daylight saving is handled automatically through your browser's timezone database, based on the current date.
Countdown Timer
Watching the remaining time before a scheduled deadline, release event, examination, or holiday helps keep projects on schedule and builds excitement. The Countdown Timer provides a live countdown display powered by your browser clock. After choosing a date and time using the datetime-local input, the counter ticks automatically every second without requiring any button clicks or form submissions. The remaining duration is presented in a readable format showing days, hours, minutes, and seconds, such as 3d 5h 12m 40s. Once the target moment arrives, the display switches to Time is up!. If no date is chosen, it prompts you with Set a target time. Everything runs locally in your browser using client-side JavaScript. The tool does not intentionally send your target event times to our servers.
ISO 8601 Converter
Standardizing timestamps into the ISO 8601 international format is essential when formatting data for REST APIs, database queries, and distributed log systems. The ISO 8601 Converter takes human-readable date and time strings and normalizes them into structured UTC timestamps. By leveraging the browser's built-in Date parser, the tool reads inputs formatted like 2026-08-26 12:00:00 and converts them upon clicking To ISO 8601. The result produces a standardized representation including UTC timezone indicators and millisecond precision, such as 2026-08-26T12:00:00.000Z. If an unparseable string is supplied, an Invalid date/time notice appears. Output includes a convenient 📋 Copy button. Everything runs locally in your browser using client-side JavaScript. The tool does not intentionally send your date and timestamp entries to our servers.