Date and Time Tools
Calculate age, count business days, convert time zones, and work with Unix timestamps. Every date calculation you look up occasionally, in one place.
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Every category on ConvertNow, each one free and updated as new tools launch.
Understanding Date & Time Tools
What these tools are for, and how to get the most reliable result from them.
Dates are trickier than they look
Leap years, months of different lengths, time zone offsets and daylight saving all add small traps to date math. These tools handle that complexity for you so a quick calculation stays quick.
From timestamps to readable dates
A Unix timestamp is simply the number of seconds since a fixed point in time, and it shows up constantly in programming, logs and databases. Converting it into a readable date, and back again, is one of the most common small tasks in software work.
Built around real calendars
The week number calculator follows the ISO 8601 standard used across Europe for business and manufacturing calendars. The working days calculator understands weekends by default, so business day math stays accurate without manual adjustment.
FAQ: Date and Time Tools
Straight answers to what people ask most about these tools.
Does the time zone converter account for daylight saving time?
Yes, it applies the current daylight saving rules for both zones you select, so the converted time reflects what a clock in that location actually shows today.
What counts as a business day in the working days calculator?
Monday through Friday, excluding weekends. It does not automatically exclude public holidays since these vary by country and region, so add those manually if your calculation needs them.
What is a Unix timestamp used for?
It is a simple way for computers to store a date and time as a single number, the count of seconds since 1 January 1970. It is widely used in programming, logs and databases because it is easy to compare and sort.
Why does the age calculator show months and days, not just years?
A full breakdown is more useful for legal, medical and administrative purposes where an exact age matters, not just the nearest year.
Can I calculate a date difference that spans centuries?
Yes, the date difference calculator handles any valid calendar date range, including historical dates, using standard calendar rules.
What is the ISO week numbering system?
It is an international standard where each year has 52 or 53 full weeks, and week 1 is defined as the week containing the first Thursday of the year. It is common across Europe for business and manufacturing calendars.
How to use these tools
The same simple flow works across every tool on this page.
Choose your calculation
Age, a date difference, a time zone conversion, or a timestamp, all listed above.
Enter your date or time
Type in the date, time, or time zone the tool asks for.
Get an instant result
See the answer immediately, no separate calculate step needed.
Recalculate freely
Change any input to check a different date without reloading the page.
Syntax and reference
Formulas, formats and quick references used across this category.
Common date format tokens
| YYYY | Four digit year, for example 2026 |
|---|---|
| MM | Two digit month, 01 through 12 |
| DD | Two digit day, 01 through 31 |
| HH:mm:ss | 24 hour time with hours, minutes and seconds |
ISO 8601 example
2026-07-12T14:30:00ZUnix timestamp definition
A Unix timestamp counts the whole seconds elapsed since 1 January 1970, 00:00:00 UTC, often called the Unix epoch.Built to be trusted, every time
No dark patterns, no forced accounts, and nothing you type is kept longer than it takes to give you an answer.
Nothing you enter is stored
Inputs are used only to generate your result, in that moment.
Free, with no catch
No sign up, no trial period, no hidden paywall on any tool.
Works on any device
Every tool is built to work on desktop, tablet and mobile.