1. What is Date/Time Addition?

Date/Time addition calculates a new point in time by adding a duration to a starting date/time. This is useful for scheduling, project planning, and time-based calculations.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• DateTime — The starting date and time
• Duration — The time period to add (days, hours, minutes, seconds)

Explanation: The calculator creates a DateTime object from your input, then adds the specified duration using PHP's DateInterval functionality.

3. Practical Applications

Details: This calculation is essential for event planning, medication schedules, project deadlines, rental periods, and any scenario where you need to know when a time period will complete.

4. Using the Calculator

Tips: Enter a starting date/time (defaults to current time), then specify the duration to add in days, hours, minutes, and seconds. All duration fields accept zero if not needed.

5. Frequently Asked Questions (FAQ)

Q1: Does this account for daylight saving time?
A: Yes, the PHP DateTime functions automatically handle daylight saving time transitions.

Q2: What's the maximum duration I can add?
A: The calculator can handle very large durations, though extremely large values may take longer to process.

Q3: Can I subtract time instead of adding?
A: This calculator only adds time. For subtraction, you would need a separate calculator.

Q4: What timezone is used?
A: The calculation uses the server's default timezone unless specified otherwise.

Q5: Can I add months or years?
A: This version adds precise time intervals. Adding months/years would require a different approach due to variable month lengths.