Free browser-based tools
Date & Time Tools
Date, time, timezone, business day, age, countdown, and Unix timestamp tools that run in your browser. Built for project managers, remote teams, developers, students, and operations teams.
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Date Math
Date Duration Calculator
Calculate days, weeks, months, and years between two dates. Date MathDate Add or Subtract Calculator
Add or subtract days, weeks, months, and years from a date. Business DaysBusiness Days Calculator
Count weekdays between two dates and optionally exclude common weekend days. Date MathAge Calculator
Calculate age in years, months, days, and total days. Date MathCountdown Calculator
Calculate time remaining until a target date and time. Date MathWeek Number Calculator
Find ISO week number, day of year, and quarter. Time ZonesTime Zone Offset Converter
Convert time between UTC offsets. TimestampsUnix Time Converter
Convert Unix seconds and milliseconds to local and ISO time. TimestampsISO Date Parser
Parse ISO date strings into local time, UTC time, and Unix seconds. Date MathQuarter Calculator
Find calendar quarter, start date, and end date. Date MathLeap Year Checker
Check whether a year is a leap year. Business DaysWorking Hours Calculator
Estimate working hours between dates using weekday count. Date MathDays Until Date Calculator
Calculate how many days remain until a deadline, launch date, trip, or event. Date MathDays Since Date Calculator
Calculate elapsed days since a start date for projects, habits, warranties, and records. Date MathAdd Weeks to Date Calculator
Add or subtract weeks from a date for planning sprints, lessons, trips, and reminders. Business DaysProject Business Days Calculator
Count weekdays between project dates and estimate working-day capacity. Time ZonesUTC Offset Meeting Converter
Convert a meeting time between two UTC offsets for remote teams and scheduling notes. TimestampsTimestamp to ISO Converter
Convert Unix timestamps to ISO and local time for logs, APIs, and debugging. TimestampsISO to Unix Converter
Parse an ISO date string into local time, UTC, and Unix seconds. Date MathSchool Year Age Calculator
Calculate a learner age on a specific school, camp, or program date. Date MathAdvanced Date Duration Calculator
Calculate days, weeks, months, and years between two dates. Use this focused variant for advanced workflows and long-tail search scenarios. Date MathQuick Date Add or Subtract Calculator
Add or subtract days, weeks, months, and years from a date. Use this focused variant for quick workflows and long-tail search scenarios. Business DaysPlanning Business Days Calculator
Count weekdays between two dates and optionally exclude common weekend days. Use this focused variant for planning workflows and long-tail search scenarios. Date MathMobile Age Calculator
Calculate age in years, months, days, and total days. Use this focused variant for mobile workflows and long-tail search scenarios. Date MathSmall Business Countdown Calculator
Calculate time remaining until a target date and time. Use this focused variant for small business workflows and long-tail search scenarios. Date MathCreator Week Number Calculator
Find ISO week number, day of year, and quarter. Use this focused variant for creator workflows and long-tail search scenarios. Time ZonesStudent Time Zone Offset Converter
Convert time between UTC offsets. Use this focused variant for student workflows and long-tail search scenarios. TimestampsTeam Unix Time Converter
Convert Unix seconds and milliseconds to local and ISO time. Use this focused variant for team workflows and long-tail search scenarios. TimestampsAudit ISO Date Parser
Parse ISO date strings into local time, UTC time, and Unix seconds. Use this focused variant for audit workflows and long-tail search scenarios. Date MathChecklist Quarter Calculator
Find calendar quarter, start date, and end date. Use this focused variant for checklist workflows and long-tail search scenarios. Date MathCampaign Leap Year Checker
Check whether a year is a leap year. Use this focused variant for campaign workflows and long-tail search scenarios. Business DaysBatch Working Hours Calculator
Estimate working hours between dates using weekday count. Use this focused variant for batch workflows and long-tail search scenarios.Date Math
Date Math
Focused tools for common date & time tools workflows.
Date Math
Date Duration Calculator
Calculate days, weeks, months, and years between two dates. Date MathDate Add or Subtract Calculator
Add or subtract days, weeks, months, and years from a date. Date MathAge Calculator
Calculate age in years, months, days, and total days. Date MathCountdown Calculator
Calculate time remaining until a target date and time. Date MathWeek Number Calculator
Find ISO week number, day of year, and quarter. Date MathQuarter Calculator
Find calendar quarter, start date, and end date. Date MathLeap Year Checker
Check whether a year is a leap year. Date MathDays Until Date Calculator
Calculate how many days remain until a deadline, launch date, trip, or event. Date MathDays Since Date Calculator
Calculate elapsed days since a start date for projects, habits, warranties, and records. Date MathAdd Weeks to Date Calculator
Add or subtract weeks from a date for planning sprints, lessons, trips, and reminders. Date MathSchool Year Age Calculator
Calculate a learner age on a specific school, camp, or program date. Date MathAdvanced Date Duration Calculator
Calculate days, weeks, months, and years between two dates. Use this focused variant for advanced workflows and long-tail search scenarios. Date MathQuick Date Add or Subtract Calculator
Add or subtract days, weeks, months, and years from a date. Use this focused variant for quick workflows and long-tail search scenarios. Date MathMobile Age Calculator
Calculate age in years, months, days, and total days. Use this focused variant for mobile workflows and long-tail search scenarios. Date MathSmall Business Countdown Calculator
Calculate time remaining until a target date and time. Use this focused variant for small business workflows and long-tail search scenarios. Date MathCreator Week Number Calculator
Find ISO week number, day of year, and quarter. Use this focused variant for creator workflows and long-tail search scenarios. Date MathChecklist Quarter Calculator
Find calendar quarter, start date, and end date. Use this focused variant for checklist workflows and long-tail search scenarios. Date MathCampaign Leap Year Checker
Check whether a year is a leap year. Use this focused variant for campaign workflows and long-tail search scenarios.Business Days
Business Days
Focused tools for common date & time tools workflows.
Business Days
Business Days Calculator
Count weekdays between two dates and optionally exclude common weekend days. Business DaysWorking Hours Calculator
Estimate working hours between dates using weekday count. Business DaysProject Business Days Calculator
Count weekdays between project dates and estimate working-day capacity. Business DaysPlanning Business Days Calculator
Count weekdays between two dates and optionally exclude common weekend days. Use this focused variant for planning workflows and long-tail search scenarios. Business DaysBatch Working Hours Calculator
Estimate working hours between dates using weekday count. Use this focused variant for batch workflows and long-tail search scenarios.Time Zones
Time Zones
Focused tools for common date & time tools workflows.
Time Zones
Time Zone Offset Converter
Convert time between UTC offsets. Time ZonesUTC Offset Meeting Converter
Convert a meeting time between two UTC offsets for remote teams and scheduling notes. Time ZonesStudent Time Zone Offset Converter
Convert time between UTC offsets. Use this focused variant for student workflows and long-tail search scenarios.Timestamps
Timestamps
Focused tools for common date & time tools workflows.
Timestamps
Unix Time Converter
Convert Unix seconds and milliseconds to local and ISO time. TimestampsISO Date Parser
Parse ISO date strings into local time, UTC time, and Unix seconds. TimestampsTimestamp to ISO Converter
Convert Unix timestamps to ISO and local time for logs, APIs, and debugging. TimestampsISO to Unix Converter
Parse an ISO date string into local time, UTC, and Unix seconds. TimestampsTeam Unix Time Converter
Convert Unix seconds and milliseconds to local and ISO time. Use this focused variant for team workflows and long-tail search scenarios. TimestampsAudit ISO Date Parser
Parse ISO date strings into local time, UTC time, and Unix seconds. Use this focused variant for audit workflows and long-tail search scenarios.Guides
Use the tools well
Short guides for practical workflows and review habits.
Guide