1. The problem is to subtract two dates and express the difference in hours. 2. To do this, you first find the time difference between the two dates, which is usually given in days, hours, minutes, and seconds. 3. Convert the entire difference into hours by using the formula: $$\text{Total hours} = (\text{days} \times 24) + \text{hours} + \frac{\text{minutes}}{60} + \frac{\text{seconds}}{3600}$$ 4. This formula adds the hours component to the converted days (in hours) and fractional hours from minutes and seconds. 5. If you provide the specific dates or timestamps, I can help you calculate the exact hour difference.