Start date
The start date is the first day counted in the duration. Choosing the issuance date of a work order ensures you capture the full service period.
End date
The end date is when the event concludes. Submitting 31 March 2025 for a financial year helps confirm compliance deadlines.
Inclusive counting
Inclusive counting adds one extra day by including the end date. Hotel bookings often use inclusive counting to show the number of nights stayed.
Exclusive counting
Exclusive counting omits the end date. Project reports frequently use this method to avoid double-counting overlapping days.
Business days
Business days skip weekends (and optionally holidays). HR teams use this value for notice periods, ensuring employees receive the correct working-day notice.
Elapsed time
Elapsed time is the total duration between two points. Warranty claims rely on elapsed time to confirm coverage periods.
Lead time
Lead time tracks the waiting period before an event, such as 90 days before a product launch. It helps supply chains prepare inventory.
Rolling deadline
A rolling deadline extends as time passes. For example, a 30-day payment window resets with each invoice. Calculating start and end dates clarifies the cutoff.
Milestone checkpoint
A milestone checkpoint is a predefined date where progress is reviewed. Construction teams evaluate deliverables at every 30-day milestone derived from the calculator.
Countdown timer
A countdown timer shows remaining days until the end date. Marketing teams use it to schedule campaign pushes as the deadline approaches.