Date & Time
Unix timestamp converters, countdown timers, timezone difference checkers, and calendar tools.
Free online Date & Time Math tools.
Add Business Days Calculator
Calculate add business days calculator accurately using UTC-based date math — no time-zone off-by-one-day bugs.
Add Months Calculator
Calculate add months calculator accurately using UTC-based date math — no time-zone off-by-one-day bugs.
Add Weeks Calculator
Calculate add weeks calculator accurately using UTC-based date math — no time-zone off-by-one-day bugs.
Add Years Calculator
Calculate add years calculator accurately using UTC-based date math — no time-zone off-by-one-day bugs.
Age Calculator
Calculate exact age in years, months, days, hours, and minutes from birthdate.
Annual Working Hours Calculator
Convert or calculate annual working hours calculator instantly with accurate hour/minute/second math.
Audio Duration Calculator
Convert or calculate audio duration calculator instantly with accurate hour/minute/second math.
Break Time Calculator
Convert or calculate break time calculator instantly with accurate hour/minute/second math.
Business Quarter Calculator
Calculate business quarter calculator accurately using UTC-based date math — no time-zone off-by-one-day bugs.
Calendar Duration Calculator
Calculate calendar duration calculator accurately using UTC-based date math — no time-zone off-by-one-day bugs.
Countdown
Live real-time countdown timer to any upcoming event, holiday, or deadline.
Date → Timestamp
Convert calendar date and time into integer Unix epoch seconds.
Date Difference
Calculate precise duration between two calendar dates in days, weeks, and months.
Date Range Generator
Calculate date range generator accurately using UTC-based date math — no time-zone off-by-one-day bugs.
Days in Month
Find exact number of calendar days in any specific month and year.
Days Remaining in Month
Calculate days remaining in month accurately using UTC-based date math — no time-zone off-by-one-day bugs.
Days Remaining in Year
Calculate days remaining in year accurately using UTC-based date math — no time-zone off-by-one-day bugs.
Decimal Hours Converter
Convert or calculate decimal hours converter instantly with accurate hour/minute/second math.
Decimal Minutes Converter
Convert or calculate decimal minutes converter instantly with accurate hour/minute/second math.
Delivery Date Calculator
Calculate delivery date calculator accurately using UTC-based date math — no time-zone off-by-one-day bugs.
Due Date from Start Date
Calculate due date from start date accurately using UTC-based date math — no time-zone off-by-one-day bugs.
Epoch Time Calculator
Calculate epoch time calculator accurately using UTC-based date math — no time-zone off-by-one-day bugs.
Every N Days Calculator
Calculate every n days calculator accurately using UTC-based date math — no time-zone off-by-one-day bugs.
Every N Months Calculator
Calculate every n months calculator accurately using UTC-based date math — no time-zone off-by-one-day bugs.
Every N Weeks Calculator
Calculate every n weeks calculator accurately using UTC-based date math — no time-zone off-by-one-day bugs.
Fiscal Quarter Calculator
Calculate fiscal quarter calculator accurately using UTC-based date math — no time-zone off-by-one-day bugs.
Fiscal Year Calculator
Calculate fiscal year calculator accurately using UTC-based date math — no time-zone off-by-one-day bugs.
Free Trial Days Calculator
Calculate free trial days calculator accurately using UTC-based date math — no time-zone off-by-one-day bugs.
Fridays Between Dates
Calculate fridays between dates accurately using UTC-based date math — no time-zone off-by-one-day bugs.
Hours Per Month Calculator
Convert or calculate hours per month calculator instantly with accurate hour/minute/second math.
Hours Per Week Calculator
Convert or calculate hours per week calculator instantly with accurate hour/minute/second math.
Hours Per Year Calculator
Convert or calculate hours per year calculator instantly with accurate hour/minute/second math.
Hours to Time Converter
Convert or calculate hours to time converter instantly with accurate hour/minute/second math.
Julian Date Converter
Calculate julian date converter accurately using UTC-based date math — no time-zone off-by-one-day bugs.
Leap Year Checker
Verify if any given calendar year is a leap year with 366 days.
Minutes Per Day Calculator
Convert or calculate minutes per day calculator instantly with accurate hour/minute/second math.
Minutes to Time Converter
Convert or calculate minutes to time converter instantly with accurate hour/minute/second math.
Mondays Between Dates
Calculate mondays between dates accurately using UTC-based date math — no time-zone off-by-one-day bugs.
Month End Date Calculator
Calculate month end date calculator accurately using UTC-based date math — no time-zone off-by-one-day bugs.
Month Start Date Calculator
Calculate month start date calculator accurately using UTC-based date math — no time-zone off-by-one-day bugs.
Monthly Timesheet Calculator
Convert or calculate monthly timesheet calculator instantly with accurate hour/minute/second math.
Months Remaining in Year
Calculate months remaining in year accurately using UTC-based date math — no time-zone off-by-one-day bugs.
Night Shift Hours Calculator
Convert or calculate night shift hours calculator instantly with accurate hour/minute/second math.
Playback Speed Calculator
Convert or calculate playback speed calculator instantly with accurate hour/minute/second math.
Probation End Date Calculator
Calculate probation end date calculator accurately using UTC-based date math — no time-zone off-by-one-day bugs.
Project Duration Calculator
Calculate project duration calculator accurately using UTC-based date math — no time-zone off-by-one-day bugs.
Quarter Calculator
Calculate quarter calculator accurately using UTC-based date math — no time-zone off-by-one-day bugs.
Recurring Date Calculator
Calculate recurring date calculator accurately using UTC-based date math — no time-zone off-by-one-day bugs.
Seconds Between Times Calculator
Convert or calculate seconds between times calculator instantly with accurate hour/minute/second math.
Seconds Per Day Calculator
Convert or calculate seconds per day calculator instantly with accurate hour/minute/second math.
Seconds to Time Converter
Convert or calculate seconds to time converter instantly with accurate hour/minute/second math.
Shift Duration Calculator
Convert or calculate shift duration calculator instantly with accurate hour/minute/second math.
Shift End Time Calculator
Convert or calculate shift end time calculator instantly with accurate hour/minute/second math.
Shift Start Time Calculator
Convert or calculate shift start time calculator instantly with accurate hour/minute/second math.
Speaking Pace Calculator
Convert or calculate speaking pace calculator instantly with accurate hour/minute/second math.
Specific Weekday Counter
Calculate specific weekday counter accurately using UTC-based date math — no time-zone off-by-one-day bugs.
Split Shift Calculator
Convert or calculate split shift calculator instantly with accurate hour/minute/second math.
Stopwatch
High-precision digital stopwatch with split lap timing and pause/resume.
Subscription Renewal Date Calculator
Calculate subscription renewal date calculator accurately using UTC-based date math — no time-zone off-by-one-day bugs.
Subtract Business Days Calculator
Calculate subtract business days calculator accurately using UTC-based date math — no time-zone off-by-one-day bugs.
Time Addition Calculator
Convert or calculate time addition calculator instantly with accurate hour/minute/second math.
Time Division Calculator
Convert or calculate time division calculator instantly with accurate hour/minute/second math.
Time Multiplication Calculator
Convert or calculate time multiplication calculator instantly with accurate hour/minute/second math.
Time Saved by Speed Calculator
Convert or calculate time saved by speed calculator instantly with accurate hour/minute/second math.
Time Subtraction Calculator
Convert or calculate time subtraction calculator instantly with accurate hour/minute/second math.
Time to Decimal Hours
Convert or calculate time to decimal hours instantly with accurate hour/minute/second math.
Time to Decimal Minutes
Convert or calculate time to decimal minutes instantly with accurate hour/minute/second math.
Time Zone Converter
Convert scheduled meeting hours across UTC, EST, PST, GMT, IST, and JST.
Timesheet Calculator
Convert or calculate timesheet calculator instantly with accurate hour/minute/second math.
Timestamp → Date
Convert Unix epoch timestamp seconds or milliseconds into human-readable dates.
Trial End Date Calculator
Calculate trial end date calculator accurately using UTC-based date math — no time-zone off-by-one-day bugs.
Unix Millisecond Converter
Calculate unix millisecond converter accurately using UTC-based date math — no time-zone off-by-one-day bugs.
Unix Time Difference
Calculate unix time difference accurately using UTC-based date math — no time-zone off-by-one-day bugs.
Unix Timestamp
Current real-time Unix epoch seconds with millisecond precision.
Video Duration Calculator
Convert or calculate video duration calculator instantly with accurate hour/minute/second math.
Video Watch Time Calculator
Convert or calculate video watch time calculator instantly with accurate hour/minute/second math.
Week Number
Calculate current ISO-8601 calendar week number of the year.
Weekdays Between Dates
Calculate weekdays between dates accurately using UTC-based date math — no time-zone off-by-one-day bugs.
Weekend Days Between Dates
Calculate weekend days between dates accurately using UTC-based date math — no time-zone off-by-one-day bugs.
Weekends Between Dates
Calculate weekends between dates accurately using UTC-based date math — no time-zone off-by-one-day bugs.
Weekly Timesheet Calculator
Convert or calculate weekly timesheet calculator instantly with accurate hour/minute/second math.
Weeks Remaining in Year
Calculate weeks remaining in year accurately using UTC-based date math — no time-zone off-by-one-day bugs.
Work Hours Calculator
Convert or calculate work hours calculator instantly with accurate hour/minute/second math.
Working Days Calculator
Calculate total business days excluding weekends and holidays between dates.
World Clock
View live current local times across major global timezones and cities.
Year End Date Calculator
Calculate year end date calculator accurately using UTC-based date math — no time-zone off-by-one-day bugs.
Year Start Date Calculator
Calculate year start date calculator accurately using UTC-based date math — no time-zone off-by-one-day bugs.