Date difference
Uses calendar dates at UTC midnight and excludes the starting day.
Time and work planning ↗THE SUMFIZZ LIBRARY
Time and work planning calculators
Explore 25 free tools for time and work planning. Find date difference, add or subtract dates, business days between dates and more. Each calculator explains its inputs and method, with examples you can try using your own numbers.
THE SUMFIZZ LIBRARY
What are we working out?
Add or subtract dates
Months are added first, clamping to the last valid day of the target month.
Time and work planning ↗Business days between dates
Includes both dates.
Time and work planning ↗Business-day deadline
The start date is not counted.
Time and work planning ↗Age on a date
Uses completed calendar years.
Time and work planning ↗Time duration
An earlier end time is treated as the next day.
Time and work planning ↗Time arithmetic
Enter signed minutes to add or subtract durations.
Time and work planning ↗Decimal hours converter
Converts decimal hours into hours and minutes, rounded to the nearest minute.
Time and work planning ↗Timesheet total
Enter one shift per line.
Time and work planning ↗Shift pay
Uses one entered overtime threshold and multiplier.
Time and work planning ↗Overlapping shifts
Same-day intervals only.
Time and work planning ↗Meeting time-zone overlap
Checks one-hour UTC slots whose starts fall within both local work windows during the selected UTC day.
Time and work planning ↗Countdown
A reproducible countdown between two explicit timestamps.
Time and work planning ↗Recurring event dates
Generates a fixed calendar-day recurrence, including the first date.
Time and work planning ↗Week number
ISO weeks begin Monday; week 1 contains January 4.
Time and work planning ↗Workdays remaining
Counts both endpoints, excluding weekends and the dates you supply.
Time and work planning ↗Leave balance
A simple linear accrual balance.
Time and work planning ↗Task effort forecast
Assumes work can be divided across the team without dependencies, coordination overhead or bottlenecks.
Time and work planning ↗Three-point project estimate
Uses the PERT weighted estimate.
Time and work planning ↗Critical path
Uses a directed acyclic dependency graph with unlimited resources.
Time and work planning ↗Pomodoro session planner
Breaks occur only between focus blocks.
Time and work planning ↗Reading time
Reading speed is your assumption.
Time and work planning ↗Speaking time
Adds explicit pause time to a constant speaking-rate estimate.
Time and work planning ↗Typing completion time
Correction allowance increases the estimated typing time; research and drafting time are excluded.
Time and work planning ↗Deadline capacity gap
Assumes work is distributable and every entered hour is productive.
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