Time & Work Shift Duration Calculator • වේලාව සහ වැඩ මුර කාල කැල්කියුලේටරය
Calculate exact duration between two clock times, midnight crossing shifts, work hours, overtime (OT), and add or subtract hours and minutes.
1. Time Interval & Shift Duration (වේලාවන් දෙකක් අතර වෙනස)
Calculate duration between starting and ending times
2. Add or Subtract Hours & Minutes (පැය/මිනිත්තු එකතු හෝ අඩු කිරීම)
Find the resulting clock time after offset
Sri Lanka Statutory Work Shift & Overtime Norms (වැඩ මුර සහ අතිකාල සීමා)
Standard statutory working shift limits, rest intervals, and overtime multipliers applicable to Sri Lankan private and corporate sector employment.
| Work Category | Statutory Duration | Rest / Meal Interval | Legal Limit / Overtime Rate |
|---|---|---|---|
| Full Working Day (සම්පූර්ණ දිනය) | 8 Hours | 1 Hour meal break | Max 8 hrs/day exclusive of intervals |
| Weekly Limit (සතිපතා සීමාව) | 45 Hours | 1.5 Days weekly rest | Total regular hours capped at 45 hrs/week |
| Overtime (OT / අතිකාල) | Beyond 8 hrs | Regular intervals | 1.5× Hourly basic wage rate |
| Half-Day Saturday (අර්ධ දිනය) | 4 to 5 Hours | Optional tea break | Normally completed by 1:00 PM |
| Overnight Shift (රාත්රී මුරය) | 8 Hours (Overnight) | Midnight meal break | Subject to transport & safety compliance |
Frequently Asked Questions • නිතර අසන ප්රශ්න
How does the calculator handle time intervals that cross midnight?
When the end time is numerically earlier than the start time (for example, starting at 10:00 PM and ending at 06:00 AM the next morning), the algorithm automatically adds 24 hours (1,440 minutes) to resolve the overnight duration as 8 hours without requiring date entry.
What are the statutory working hours under Sri Lanka's Shop and Office Employees Act?
Under the Shop and Office Employees Act of Sri Lanka, normal working hours are limited to 8 hours per day (excluding a 1-hour interval for meals or rest) and 45 hours in any single week. Any time worked beyond 8 hours per day constitutes overtime payable at 1.5 times the hourly rate.
How do you convert decimal hours into hours and minutes?
To convert decimal hours into minutes, multiply the fractional part by 60. For example, 7.75 hours is 7 hours plus (0.75 × 60) = 45 minutes, resulting in 7 hours and 45 minutes.
Can I add multiple shift segments together?
Yes, using the Add/Subtract Time function, you can input a starting time and add consecutive hours and minutes to model multi-stage shifts or travel itineraries.
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