Como criar uma calculadora de horas de trabalho precisa em C# para relatórios diários e mensais?

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1. Handle Time Formats

Use DateTime.ParseExact() or TimeSpan.ParseExact() with a defined format ("HH:mm") to ensure consistent input and avoid parsing errors.

DateTime clockIn = DateTime.ParseExact("09:00", "HH:mm", CultureInfo.InvariantCulture);
DateTime clockOut = DateTime.ParseExact("18:00", "HH:mm", CultureInfo.InvariantCulture);
TimeSpan breakTime = TimeSpan.FromMinutes(60);

DateTime.ParseExact Documentation

Custom Date and Time Format Strings

2. Choose the Right Data Types

• Use DateTime for specific timestamps (e.g., clock-in/out).
• Use TimeSpan for durations (e.g., hours worked, breaks, overtime, balances).

TimeSpan worked = (clockOut - clockIn) - breakTime;
double totalHours = worked.TotalHours;

DateTime vs TimeSpan Comparison

TimeSpan Struct Overview

3. Generate Daily and Monthly Reports

• Daily: (clockOut - clockIn) - breakDuration
• Monthly: Aggregate all daily TimeSpan values.

List<TimeSpan> dailyHours = new List<TimeSpan>
{
    TimeSpan.FromHours(8),
    TimeSpan.FromHours(7.5),
    TimeSpan.FromHours(9)
};
 

LINQ Sum Method

LINQ Aggregate Method

4. Overtime & Hour Bank Calculation

• Define standard working hours (e.g., 8 hours/day).
• Calculate overtime and monthly balance.

TimeSpan regular = TimeSpan.FromHours(8);
TimeSpan overtime = worked > regular ? worked - regular : TimeSpan.Zero;
 

TimeSpan.Compare Method

5. Handling Overnight Shifts

Overnight shifts (e.g., 10 PM to 6 AM) require special handling since clockOut may be earlier than clockIn.

if (clockOut < clockIn)
{
    clockOut = clockOut.AddDays(1); // shift ends next day
}
TimeSpan worked = (clockOut - clockIn) - breakTime;

Handling Overnight Shifts

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