Calculator Tools
Date Toolkit
Calculate ages, date differences, business days and week numbers, or convert Unix timestamps and time zones instantly.
Overview
Calculate ages, date differences, business days and week numbers, or convert Unix timestamps and time zones instantly. This overview compares the available workflows so you can choose the smallest tool that completes the task without opening heavyweight software.
The toolkit currently connects Age Calculator, Date Difference Calculator, Add Days to Date, Unix Timestamp Converter, Week Number Calculator, and related utilities. Each one has a direct URL, focused controls and guidance for checking the result before it moves into another project.
Benefits
- Start from the toolkit page when you want to compare related utilities.
- Open a specific tool page when you already know the exact task.
- Move between adjacent actions such as formatting, validating, converting, cleaning or exporting.
- Use browser-side workflows where supported so common inputs stay on your device.
Feature comparison
| Tool | Best for | Open |
|---|---|---|
| Age Calculator | Calculate exact age from a birth date with years, total days, total weeks and quick copyable results. | Open tool |
| Date Difference Calculator | Calculate days, weeks, months and years between two dates. | Open tool |
| Add Days to Date | Add or subtract days from any calendar date and copy the resulting date for planning or scheduling. | Open tool |
| Unix Timestamp Converter | Convert between Unix timestamps and human-readable dates. | Open tool |
| Week Number Calculator | Find the ISO week number, calendar year and day-of-year value for any selected date. | Open tool |
| Business Days Calculator | Count weekdays between two dates, optionally exclude listed holidays and calculate an inclusive working-day total. | Open tool |
| Timezone Converter | Convert a date and time between popular IANA time zones with daylight-saving rules handled accurately by the browser. | Open tool |
How to choose a tool
Start with the most specific task in front of you: format, validate, generate, convert, clean, compare, calculate or export. If the result needs another step, use the nearby tools in this toolkit instead of copying the same input into a separate website.
For recurring work, bookmark the exact tool URL instead of the overview. The overview remains useful when you are exploring the toolkit or deciding which utility fits a new workflow.
Tools
Browse Date Toolkit
Date Toolkit FAQ
What is included in Date Toolkit?
Date Toolkit includes Age Calculator, Date Difference Calculator, Add Days to Date, Unix Timestamp Converter, Week Number Calculator, and additional tools in the same workflow.
Which Date Toolkit tool should I use first?
Choose the page whose name matches the immediate task. The toolkit description and comparison table explain where each tool starts, what it produces and which related step may come next.
Do Date Toolkit tools upload my data?
The tools are designed around browser-side processing wherever browser APIs support the workflow, so common text, code, image and calculation tasks stay local.
Are results ready to use immediately?
Most results can be copied or downloaded immediately, but important work should still be reviewed for context, units, formatting and accuracy.
Can I bookmark tools inside Date Toolkit?
Yes. Each major function has a direct URL that opens the matching tool for repeat use.