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If you refer the link given below you can get a clear view about it:https://hubstaff.com/
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Follow below links that may help you:
https://www.codeproject.com/Tips/859004/A-Tool-Which-is-Useful-to-Calculate-the-Office-Wor
https://www.codeproject.com/Articles/322352/Employee-Attendance-Tracking
https://www.bizfilings.com/toolkit/research-topics/office-hr/calculating-an-employees-hours-worked