The net duration is 8 hours, or 8.00 decimal hours.
Date & Time calculator
Time Duration and Hours Calculator
Enter a start time, end time and break to get net working or activity hours without manual subtraction.
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No account. Formula and assumptions are shown below.
Calculator inputs
Time duration details
Formula & disclaimer
Net Duration = Time from Start to End β Break Duration; an earlier end time is treated as the next day
View assumptionsFormula reviewCalcs at Hand Editorial TeamVerified 28 August 2026 Β· automated checks included
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Resultβ
Projection
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Formula & details
Calculation
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How to read this result
Three useful checks, kept deliberately short.
From 9:00 to 17:30 with a 30-minute break: Count 8 hours 30 minutes of gross time Β· Subtract the 30-minute break Β· Convert the result to decimal hours.
Break time is deducted once from the gross duration.
Formula and assumptions
Net Duration = Time from Start to End β Break Duration; an earlier end time is treated as the next dayIf the end time is earlier than the start time, the calculator treats it as an overnight period ending the next day.
Keep in mind: Confirm your workplace rules for paid breaks, rounding and overtime before using the result for payroll.
Produced byCalcs at Hand Editorial Team
Last formula check28 August 2026
Review methodKnown examples + boundary cases
Editorial and correction policy β