Time Zone Calculators
Last updated: October 2026
Day Counter
Count the number of days between two calendar dates.
World Clock Time Converter
Instantly convert any time from one city to another, factoring in UTC offsets and daylight saving time.
Business Hours Overlap Calculator
Find the overlapping working hours between two offices in different time zones.
Hours Calculator
Work out the hours and minutes between two clock times, with a break taken off.
Date and Time Duration Calculator
Find the time between two dates with clock times: total hours, plus the breakdown into days, hours and minutes, total minutes and weeks.
Business Days Calculator
Count the working days between two dates, or add a number of business days to a date, skipping Saturdays, Sundays and, if you choose, the eleven US federal holidays, which are worked out by rule for every year in the range.
Day of the Week Calculator
Given any calendar date in YYYY-MM-DD form, return the day of the week (Monday through Sunday) under the Gregorian calendar, for historical dates as well as dates far in the future.
Days from Today Calculator
Compute the date N days from today (or N days ago for negative N).
Week Number Calculator
Find the ISO 8601 week number and week-based year of any date, the US-style week number (weeks starting on Sunday), the day of the year and the days left in the year.
Global Team Work Hours Overlap Calculator
Find the shared working hours between two remote teams located in different time zones.
Shift Work Schedule Calculator
Calculate the midpoint of a worker's shift in company HQ time, so remote and global teams can align check-ins and reporting windows.
Meeting Time Across Time Zones Calculator
Convert your preferred meeting time into a participant's local time and check whether it falls within business hours.
Military Time Converter
Convert between 12-hour AM/PM civilian time and 24-hour military time.
International Deadline Converter
Convert a project deadline from one time zone to your local working time, accounting for a safety buffer scaled by task complexity.
Circadian Rhythm Adjustment Calculator
Estimate your adjusted bedtime target when shifting your sleep schedule across time zones before or after travel.
Minutes to Decimal Hours Converter
Convert hours and minutes to decimal hours for payroll and billing (7 h 45 min = 7.75), or decimal hours back to hours and minutes, with optional rounding to the nearest tenth or quarter hour and a full 1 to 60 minute conversion chart.
Global Event Timing Calculator
Estimates a reach-and-engagement score for a globally timed event by weighing attendee count, geographic spread, duration, weekday preference, and repeat frequency.
Days Until Calculator (Countdown)
Count the days until any date, or until the next Christmas, Thanksgiving, Easter, Halloween, New Year and other holidays, computed from their calendar rules.
Solar Time vs Clock Time Calculator
Convert standard clock time to true solar time for any location and date.
Global Trading Hours Calculator
Estimate how many effective trading hours overlap between your home market and a target market each day.
Daylight Saving Time Impact Calculator
Quantify how many extra hours per week your meeting schedule is disrupted when DST transitions create a temporary offset mismatch between two regions.
24/7 Global Coverage Calculator
Determine the minimum staffing per location needed to maintain uninterrupted 24/7 operations, factoring in shift length and handoff overlap.