Calculate Hourly Rate

calculateHourlyRate.js

function isTimeFormatValid(timeString) {
  const timeRegex = /^(?:(?:([01]?\d|2[0-3]):)?([0-5]?\d):)?([0-5]?\d)$/;
  const dateTimeRegex = /^\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}$/;

  return timeRegex.test(timeString) || dateTimeRegex.test(timeString);
}

function calculateHourlyRate({ startTime, endTime, pricePerHour }) {
  // Check if start time and end time are in a valid format
  if (!isTimeFormatValid(startTime) || !isTimeFormatValid(endTime)) {
    throw new Error('Invalid time format')
  }

  // Convert times to Date objects
  const start = new Date(`01/01/2000 ${startTime}`);
  const end = new Date(`01/01/2000 ${endTime}`);

  // Check if start time is greater than end time
  if (start.getTime() > end.getTime()) {
    return 0;
  }
  
  // Calculate time difference in milliseconds
  const timeDiff = end.getTime() - start.getTime();
  
  // Convert time difference to hours and minutes
  const hoursWorked = Math.floor(timeDiff / (1000 * 60 * 60));
  const minutesWorked = Math.floor((timeDiff / (1000 * 60)) % 60);
  
  // Calculate total value based on hourly rate
  const totalValue = (hoursWorked + (minutesWorked / 60)) * pricePerHour;
  
  return Math.ceil(totalValue);
}

console.log(calculateHourlyRate({ startTime: '00:01', endTime: '01:30', pricePerHour: 10 })); // Output: 15
console.log(calculateHourlyRate({ startTime: '02:00', endTime: '01:00', pricePerHour: 10 })); // Output: 0
console.log(calculateHourlyRate({ startTime: '2022-04-01 09:30:00', endTime: '2022-04-01 18:00:00', pricePerHour: 20 })); // Output: 180
console.log(calculateHourlyRate({ startTime: '2022-04-01 09:30', endTime: '2022-04-01 18:00', pricePerHour: 20 })); // Output: 180
console.log(calculateHourlyRate({ startTime: '09:30', endTime: '18:00', pricePerHour: 20 })); // Output: 180
console.log(calculateHourlyRate({ startTime: 'invalid time format', endTime: '18:00', pricePerHour: 20 })); // Output: 'Invalid time format'