DUE.RED / FREE DATE & TIME TOOLS
Make time work for you.
Find a time to meet. Focus on what matters. Get your dates right. Twenty free tools, no account needed.
20 tools · All free
Time zones & meetings
Time zone converter
Convert a date and time between IANA time zones. Check the local date, UTC offset and daylight saving before a call or trip.
Open tool →Meeting planner across time zones
Find overlapping working hours for 2–6 locations, compare local meeting times and export a calendar event. Free, with no invitations sent.
Open tool →World clock — compare current times
See the current date and time in up to eight time zones. Compare cities with date changes and UTC offsets in one view.
Open tool →Timers & focus
Countdown to a date and time
Create a private countdown to a launch, trip or event. Choose the target time zone and see days, hours, minutes and seconds remaining.
Open tool →Online timer with pause and resume
Set a free countdown timer in hours, minutes and seconds. Pause, resume, reset or use fullscreen, with an optional finish sound.
Open tool →Online stopwatch with laps
Measure elapsed time, pause and resume, record up to 100 laps and download them as CSV. Free, private and ready in one click.
Open tool →Pomodoro timer — focus and break intervals
Work in focused sessions with custom short and long breaks. A free Pomodoro timer with pause, reset, fullscreen and optional sound.
Open tool →Dates & deadlines
Days between dates calculator
Count days between two dates with explicit start and end inclusion. See full weeks and remaining days, free.
Open tool →Add or subtract days — due date calculator
Find a date 7, 30 or 90 days ahead, or count backwards. Choose calendar days or a custom workweek and days off.
Open tool →Working days calculator with custom weekends
Count business days between dates using your own workweek, days off and endpoint rules. Any weekly schedule is supported.
Open tool →Age calculator in years, months and days
Calculate age on any date, with total elapsed days and explicit CE or Thai BE input. Free, with no account.
Open tool →Employment tenure and duration calculator
Measure time from a starting date in complete years, months and days. Also see total elapsed days. Supports CE and Thai BE.
Open tool →ISO week number and day of year calculator
Find the ISO week, week-year, Monday–Sunday range and day of the year for any date. Check year-boundary weeks accurately.
Open tool →Recurring date generator with calendar export
Generate a series every N days, weeks or months. Choose how month-end dates behave, then download the dates or a one-time .ics calendar file.
Open tool →Hours & durations
Time duration calculator between dates and times
Find exact elapsed hours, minutes and seconds between two local date-times, including daylight-saving changes in the selected time zone.
Open tool →Time converter — decimal hours, minutes and seconds
Convert durations between HH:MM:SS, decimal hours, minutes, seconds and 24-hour days. See every unit together.
Open tool →Work hours calculator with breaks and overnight shifts
Add multiple shifts, subtract breaks and handle overnight work. See hours and minutes alongside decimal hours. Free and device-only.
Open tool →Calendars & formats
Free printable monthly and yearly calendar
Create a clean calendar for any month or year. Choose Monday or Sunday first, download an image, or print and save as PDF without an account.
Open tool →Date format converter — ISO, US, UK and localized dates
Turn an unambiguous ISO date into US, UK, dotted European and localized written formats, with Thai Buddhist Era conversion.
Open tool →Unix timestamp converter — seconds and milliseconds
Convert Unix epoch seconds or milliseconds to ISO UTC and back. Explicit units, negative timestamps and millisecond precision.
Open tool →Planning a break in Thailand? Open the Thai calendar & leave planner →
Tools use this tab only. Leave plans are saved on your device.