1. What is Date Addition Calculator?

This calculator adds a specified number of days to a given date and time, providing the resulting future date and time. It accounts for all calendar variations including leap years and different month lengths.

2. How Does the Calculator Work?

The calculator uses the following formula:

Where:

• Time — The original date and time
• Days — Number of days to add (can be fractional)
• New Time — Resulting date and time after addition

Explanation: The calculation converts days to hours (multiplying by 24) and adds them to the original timestamp, handling all calendar adjustments automatically.

3. Importance of Date Calculations

Details: Accurate date calculations are essential for project planning, medication schedules, legal deadlines, financial calculations, and many other time-sensitive applications.

4. Using the Calculator

Tips: Enter the original date and time, then specify the number of days to add. You can use decimal values for partial days (e.g., 2.5 days = 2 days 12 hours).

5. Frequently Asked Questions (FAQ)

Q1: Does this account for daylight saving time changes?
A: The calculation uses absolute time (24 hours per day) and doesn't adjust for DST. The result will show the clock time that would occur after the specified duration.

Q2: Can I subtract days instead of adding?
A: Yes, enter a negative number of days to subtract time from the original date.

Q3: What's the maximum/minimum date range?
A: The calculator can handle dates from year 1 to 9999, limited by PHP's DateTime implementation.

Q4: How precise is the calculation?
A: The calculation is precise to the second, and fractional days are calculated with floating-point precision.

Q5: Can I add weeks or months instead of days?
A: This calculator specifically adds days. For weeks, multiply by 7. For months, a different calculator would be needed as month lengths vary.