How to Use the Date Calculator
Choose a starting date, select Add or Subtract, and enter any combination of years, months, weeks and days. The result gives the resulting calendar date.
Adding and Subtracting Dates
Days and weeks can be moved as fixed calendar-day intervals. Months and years require calendar arithmetic because months do not all have the same number of days.
Month-End Dates
A date such as January 31 has no direct equivalent in every month. When a target month is shorter, Zelmric clamps the result to the last valid day of that month before applying additional day or week adjustments.
Date Calculator Examples
Typical uses include finding a date 30, 60 or 90 days later, calculating renewal dates, moving a deadline backward, or adding several months to a starting date.
Calendar Days vs. Business Days
This calculator uses calendar dates, so weekends are included. When you need Monday-to-Friday counting, use the Business Days Calculator instead.
Frequently Asked Questions
What happens when adding a year to February 29?
When the target year is not a leap year, Zelmric uses February 28, the last valid day of that month.
What date is 90 days from a date?
Enter the starting date, choose Add and enter 90 in the Days field.
Can I subtract months from a date?
Yes. Select Subtract and enter the number of months.
What happens when adding one month to January 31?
When the target month is shorter, the calculator uses the last valid day of that month.