60 free tools · Private · In-Browser

Time & Date Tools

Date and time math: days between dates and until a date, business days, age, week numbers, recurring dates, Unix timestamps, countdowns, time zones, moon phases and sunrise and sunset times. Useful for deadlines, scheduling and anything that crosses a weekend.

Recurring Date Generator

Free recurring date generator that calculates dates and times locally in your browser with specific examples, limits, and copy-ready output.

Week Number Calculator

Free week number calculator that calculates dates and times locally in your browser with specific examples, limits, and copy-ready output. No account required.

Epoch Time Converter

Free epoch time converter: turn epoch seconds into a readable UTC, local and ISO date, or any date and time back into an epoch timestamp, in your browser.

Moon Phase Calculator

Free moon phase calculator that calculates dates and times locally in your browser with specific examples, limits, and copy-ready output. No account required.

Countdown Timer Builder

Free countdown timer builder that calculates dates and times locally in your browser with specific examples, limits, and copy-ready output. No account required.

Easter Date Calculator

Free Easter date calculator: find the date of Easter Sunday for any year using the computus, in your browser.

Age Calculator

Free age calculator that calculates dates and times locally in your browser with specific examples, limits, and copy-ready output. No account required.

Date Difference Calculator

Free date difference calculator that calculates dates and times locally in your browser with specific examples, limits, and copy-ready output.

Sunrise Sunset Calculator

Free sunrise sunset calculator that calculates dates and times locally in your browser with specific examples, limits, and copy-ready output.

Midpoint Date Calculator

Find the date halfway between two dates. Enter a start and end date to get the midpoint date, its weekday, and the days between. Free and instant in your browser.

Add Subtract Days Calculator

Free add subtract days calculator that calculates dates and times locally in your browser with specific examples, limits, and copy-ready output.

Age in Days Weeks Hours

Free age in days weeks hours that calculates dates and times locally in your browser with specific examples, limits, and copy-ready output. No account required.

Age in Months Calculator

Free age in months calculator: find an exact age in months and days from a birth date, computed in your browser.

Days Until Since

Free days until since that calculates dates and times locally in your browser with specific examples, limits, and copy-ready output. No account required.

Habit Streak Completion Calculator

Calculate days completed and missed from planned days and a completion rate. Everything is calculated locally in your browser, with no uploads or sign-ups.

Interval Timer

Free interval timer that calculates dates and times locally in your browser with specific examples, limits, and copy-ready output. No account required.

Leap Year Checker

Free leap year checker that calculates dates and times locally in your browser with specific examples, limits, and copy-ready output. No account required.

Percentage Calculator

Free percentage calculator for percent of a number, increase, decrease, and reverse percentage calculations. Runs locally in your browser for private planning.

Renewal Reminder Planner

Create renewal reminder tasks for subscriptions, contracts, domains, and software renewals.

Time Zone Converter

Free time zone converter that calculates dates and times locally in your browser with specific examples, limits, and copy-ready output. No account required.

Week of the Month Calculator

Free week of the month calculator: find which week of the month a date falls in, computed locally in your browser.

Age Difference Calculator

Free age difference calculator: find the gap in years and days between two birth dates, computed in your browser.

Business Days Calculator

Free business days calculator that calculates dates and times locally in your browser with specific examples, limits, and copy-ready output.

Countdown Progress Calculator

Calculate days elapsed and remaining from a total and an elapsed percentage. Everything is calculated locally in your browser, with no uploads or sign-ups.

Day of the Week Calculator

Free day of the week calculator: find what weekday any date falls on, plus its day of the year, computed locally in your browser.

Day of Week Finder

Free day of week finder that calculates dates and times locally in your browser with specific examples, limits, and copy-ready output. No account required.

Days Since Date Calculator

Free days since a date calculator: count the days, weeks, and months from a past date to today, in your browser.

Days Until Date Calculator

Free days until a date calculator: count the whole days from today to any future or past date, computed locally in your browser.

Due Date Calculator

Free pregnancy due date calculator using Naegele’s rule from your last period, with current week and trimester, computed in your browser.

Military Time Converter

Free military time converter: switch between 12-hour and 24-hour clock formats, computed locally in your browser.

Next Birthday Countdown

Free next birthday countdown: find how many days until your next birthday and the age you will turn, in your browser.

Nth Weekday of Month Calculator

Free nth weekday calculator: find the date of, say, the third Monday of a month, computed in your browser.

Pomodoro Timer

Free pomodoro timer that calculates dates and times locally in your browser with specific examples, limits, and copy-ready output. No account required.

Quarter Fiscal Date Helper

Free quarter fiscal date helper that calculates dates and times locally in your browser with specific examples, limits, and copy-ready output.

Reverse Percentage Calculator

Free reverse percentage calculator: find the original amount before a percentage was added or removed, in your browser.

Study Block Planner

Calculate minutes per block from total study time and a block count. Everything is calculated locally in your browser, with no uploads or sign-ups.

Time Card Calculator

Free time card calculator that calculates dates and times locally in your browser with specific examples, limits, and copy-ready output. No account required.

Unix Timestamp Converter

Convert Unix timestamps to local and UTC dates, or dates back to seconds and milliseconds.

Add Business Days Calculator

Free add business days calculator: skip weekends to find the date a set number of working days from a start date, computed in your browser.

Baker’s Percentage Calculator

Free baker’s percentage calculator: turn hydration and ingredient percentages into weights from your flour weight, in your browser.

Business Hours Capacity Calculator

Calculate work capacity hours from workdays and productive hours per day. Everything is calculated locally in your browser, with no uploads or sign-ups.

Date Add / Subtract Calculator

Free date calculator: add or subtract days, weeks, months, or years from any date, computed locally in your browser.

Day of the Year Calculator

Free day of the year calculator: find the ordinal day number, days remaining, and ISO week for any date, computed in your browser.

Days in Month Calculator

Free days in month calculator: find how many days are in any month and year, accounting for leap years, computed in your browser.

Decimal Hours Converter

Free decimal hours converter: switch between hours-and-minutes and decimal hours for timesheets, in your browser.

Half Birthday Calculator

Free half birthday calculator: find the date exactly six months from your birthday, computed in your browser.

Initiative Average Calculator

Calculate the average initiative bonus from a total and a character count. Everything is calculated locally in your browser, with no uploads or sign-ups.

Julian Day Number Calculator

Free Julian Day Number calculator: convert a calendar date to its astronomical Julian day, in your browser.

Moving Average Calculator

Free moving average calculator: smooth a series with a simple moving average of any window, in your browser.

Quarter Calculator

Free calendar quarter calculator: find which quarter a date is in, plus days elapsed and remaining, computed locally in your browser.

Time Between Times Calculator

Free time between two times calculator: find the duration between two clock times, including overnight, in your browser.

Time Blocking Slot Calculator

Calculate how many time slots fit from available minutes and slot length. Everything is calculated locally in your browser, with no uploads or sign-ups.

Time Calculator

Free time calculator: add or subtract hours and minutes from a start time and see the resulting clock time, even past midnight, in your browser.

Weeks Between Dates Calculator

Free weeks between dates calculator: count full weeks and leftover days between two dates, computed locally in your browser.

Weighted Average Calculator

Free weighted average calculator: combine values with their weights into a single weighted mean, computed in your browser.

Workdays in a Month Calculator

Free workdays in a month calculator: count the weekdays and weekend days in any month, computed locally in your browser.

Brine Percentage Calculator

Free brine percentage calculator with labeled inputs and an immediate result. It calculates salt as a percentage of water weight privately in your browser.

Countdown to a Date

Free live countdown to any date and time: see days, hours, minutes, and seconds remaining, ticking in your browser.

Stopwatch

Free stopwatch that calculates dates and times locally in your browser with specific examples, limits, and copy-ready output. No account required.

Year Quarter Progress Calculator

Calculate days elapsed and remaining in a quarter from its length and an elapsed percentage. It runs entirely in your browser, with no uploads or accounts.