Elysia Tools
Navigation
Utilities
Add or subtract time periods from a date (years, months, days, hours, minutes, seconds)
Execution
Fill in the form, run the tool, and review the result in one place.
Samples
Related
Ready for a run
Tool usage guide
The Date Adder is a precise utility tool designed to calculate future or past dates by adding or subtracting specific time intervals, including years, months, days, hours, minutes, and seconds.
Background
A project starts on January 15, 2024, and requires a 45-day development phase.
Problem
Quickly determine the exact end date for the project schedule.
How to use
Enter '2024-01-15' as the start date, set 'Days' to 45, and select 'Add'.
startDate: 2024-01-15, days: 45, operation: add, format: dateOutcome
The tool returns '2024-02-29', accounting for the leap year.
Background
An API authentication token is generated at 14:30:00 and is valid for 3600 seconds.
Problem
Calculate the exact expiration time for the token.
How to use
Enter the current time, set 'Seconds' to 3600, and select 'Add'.
startDate: 2024-01-15T14:30:00, seconds: 3600, operation: add, format: timeOutcome
Yes, simply select the 'Subtract (-)' option from the operation dropdown menu.
The tool accepts standard ISO 8601 formats and common YYYY-MM-DD HH:MM:SS date-time strings.
Yes, the calculation engine automatically adjusts for leap years and varying month lengths.
Yes, you can choose from several output formats including ISO 8601, Date Only, Time Only, or a friendly readable format.
The tool supports a wide range of inputs, allowing you to calculate offsets spanning up to 100 years or millions of seconds.
The tool returns '15:30:00'.