DateTime Calculator

Add or subtract years, months, weeks, days, hours, minutes, and seconds to datetime inputs

DateTime

Calculator

Time

Converter

Batch

Time Values

Years

Months

Weeks

Days

Hours

Minutes

Seconds

Operation

DateTime Input

Enter datetime values (one per line):

Supports ISO format, standard format, US format, date only, and Unix timestamps.

About This Tool

The DateTime Calculator allows you to add or subtract time values from datetime inputs. You can work with individual datetime values or process multiple values in batch.

Features:

Add or subtract years, months, weeks, days, hours, minutes, seconds
Support for multiple datetime formats
Batch processing from text input or file upload
Handles leap years and varying month lengths
Download results as CSV file
Copy results to clipboard

Supported Formats:

ISO format: 2024-01-15T10:30:00Z
Standard format: 2024-01-15 10:30:00
US format: 1/15/2024 10:30 AM
Date only: 2024-01-15
Unix timestamps (seconds/milliseconds)

All processing happens in your browser - no data is sent to servers.

Frequently Asked Questions (FAQ)

What datetime formats are supported?

The tool supports ISO format (2024-01-15T10:30:00), standard format (2024-01-15 10:30:00), US format (1/15/2024 10:30), date only (2024-01-15), and Unix timestamps (both seconds and milliseconds).

Can I add and subtract different time units simultaneously?

Yes! You can combine years, months, weeks, days, hours, minutes, and seconds in a single operation. For example, add 1 year, 2 months, and 15 days all at once.

How does the tool handle leap years and month variations?

The calculator properly handles leap years and varying month lengths. When adding months or years, it accounts for the different number of days in each month and leap year considerations.

Is my data processed securely?

All processing happens in your browser. No datetime data is sent to any server, ensuring complete privacy and security of your information.

Can I process multiple datetime values at once?

Yes! You can enter multiple datetime values (one per line) in the text area or upload a file containing datetime values for batch processing.

What file formats can I upload?

You can upload TXT or CSV files containing datetime values. Each line should contain one datetime value in a supported format.

Examples

Sample Operations:

Add 1 year, 6 months:
2024-01-15 → 2025-07-15

Subtract 2 weeks, 3 days:
2024-06-15 → 2024-05-29

Add 5 hours, 30 minutes:
2024-01-15 10:00:00 → 2024-01-15 15:30:00

Sample Input:

2024-01-15 10:30:00
2024-03-20T14:45:30Z
1/15/2024 10:30 AM
2024-06-10
1642248600