所有日期与时间计算工具，汇聚于此。

Convert Unix timestamps to human dates and dates to timestamps. Accurate seconds and milliseconds handling in UTC or local zone with instant results.

Convert any calendar date and time into a Unix timestamp in seconds or milliseconds. Select UTC or your local zone and copy timestamp values instantly.

Convert Unix timestamps into readable dates in UTC and your local time zone. Handles 10-digit seconds, 13-digit milliseconds, and negative timestamps.

See the current Unix timestamp live in seconds and milliseconds with UTC and local time displays. Copy any epoch timestamp with a single click.

Convert 13-digit epoch milliseconds into readable UTC and local dates, ISO 8601 strings, and epoch seconds. Instant client-side conversion for developers.

Convert a Unix timestamp to UTC and instantly compare local times in New York, London, Berlin, Kolkata, Tokyo, and Sydney with accurate dates and offsets.

Convert ISO 8601 date strings like 2026-10-28T14:30:00Z into readable times and timestamps, or build valid ISO strings from dates, times, and offsets.

Convert 12-hour AM/PM times to 24-hour format correctly, including tricky cases like 12:00 AM (00:00) and 12:00 PM (12:00). Fast validation and copy.

Convert 24-hour times to 12-hour AM/PM format with accurate midnight (12:00 AM) and noon (12:00 PM) conversion. Instant validation and one-click copy.

Convert four-digit military time like 1430 to standard 12-hour AM/PM and 24-hour clock formats. Enter either format for instant bidirectional conversion.

View live UTC time with synchronized clock display, calendar date, ISO 8601 string, and Unix epoch seconds. Accurate, private, and client-side.

Convert dates and times between any IANA time zones. Daylight saving time is resolved for the chosen date, with clear day-change indicators and notes.

Live world clock for tracking local times across global cities. View current time, date, UTC offsets, and day differences with zero tracking or accounts.

Look up current local time in major world cities. Search global capitals and business hubs to see time, date, and UTC offsets with daylight saving applied.

Check if a time zone observes daylight saving time. View standard vs DST offsets, exact transition dates, and upcoming clock changes for any year.

Plan meetings across multiple time zones: pick a date, time, and participant locations to compare local working hours side by side with day-rollover flags.

Calculate the time difference between two IANA time zones for any date. See exact hour and minute gaps and seasonal daylight saving shift notifications.

Calculate the exact difference between two dates in years, months, and days, plus total days and weeks. Accurate calendar arithmetic with no DST drift.

Count exact calendar days between two dates with an inclusive toggle, plus weekdays, weekend days, and business days. Immune to daylight saving drift.

Find out how many days until any date, deadline, birthday, or event. Live local calendar reference with full weeks and days breakdown and past date support.

Add or subtract days, weeks, months, and years from any date. Handles month-end clamping, leap years, and calendar boundaries with auditable steps.

Calculate your exact age in years, months, and days from date of birth. Includes total days lived, next birthday countdown, and leap year handling.

Calculate business days between two dates with custom weekends and holidays, or add working days to any date. Fast, private, and customizable.

Determine the ISO 8601 week number for any date, with full week date spans and clear explanations for year-end crossover week numbers.

Find the day of the week for any historical or future date. Computes exact Gregorian weekdays, ISO week numbers, and calendar details instantly.

Check if any year is a leap year and see the four-century Gregorian leap year rule explained with adjacent leap years and February 29 details.

Free online countdown timer with hours, minutes, and seconds, preset intervals, full keyboard controls, and drift-free monotonic clock accuracy.

Accurate online stopwatch with millisecond precision, lap and split timing, pause/resume, and keyboard shortcuts. Unaffected by background tab throttling.

Online Pomodoro timer with customizable focus and break intervals, auto-cycling, session counter, and audio chimes. Stays accurate in background tabs.

Calculate elapsed duration between two times in hours and minutes. Overnight shifts are automatically detected and labeled, with decimal hours included.

Calculate work hours for shifts with start time, end time, and unpaid breaks. View gross duration, net working hours, and decimal hours in your browser.

Convert between hours:minutes and decimal hours in both directions. Converts 7:30 to exactly 7.5, and 7.75 to 7:45, with total minutes and rounding notes.