A date calculator is a tool that allows you to perform arithmetic operations on dates. It can add or subtract a specified number of days, months, or years from a given date to determine a future or past date.

The general formula for date calculation is:

\[ \text{Result Date} = \text{Start Date} \pm \text{Interval} \]

Where:

- \(\text{Result Date}\) is the final date after the calculation
- \(\text{Start Date}\) is the initial date
- \(\text{Interval}\) is the time period to add or subtract (in days, months, or years)
- \(\pm\) indicates addition or subtraction

- Identify the start date
- Determine the interval (number of days, months, or years)
- Choose the operation (addition or subtraction)
- Apply the formula: \(\text{Result Date} = \text{Start Date} \pm \text{Interval}\)
- Account for any necessary adjustments (e.g., leap years, month lengths)

Let's add 45 days to March 15, 2023:

- Start Date: March 15, 2023
- Interval: 45 days
- Operation: Addition
- Result Date = March 15, 2023 + 45 days = April 29, 2023

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