Blog
- New: an ISO week number calculator that gets the year-boundary cases right
Find the ISO 8601 week number for any date, or the Monday–Sunday range for any week — with the ISO week-numbering year shown separately from the calendar year, since they're not always the same thing.
2026-08-14 - New: a Time Zone Converter that gets Daylight Saving Time right
Convert a date and time between IANA time zones with the real, date-aware DST offset on both ends — not a hardcoded UTC difference.
2026-08-14 - New: a Time Duration Calculator that gets overnight shifts right
Find the exact hours and minutes between two clock times, with automatic overnight-shift detection and a decimal-hours total for timesheets.
2026-08-14 - New: a Next Holiday Countdown, now live in four languages
See how many days remain until the next US federal holiday, computed live from all eleven — plus genuinely localized Spanish, Italian, and Greek editions with their own national holiday calendars and their own Easter math.
2026-08-14 - New: a Leap Year Checker that explains the century exception
Check whether any year is a leap year, see exactly why via the real divisibility rule, and get the next leap years listed automatically.
2026-08-14 - New: a days-between-dates calculator that won't drift a day on you
Get the exact days, weeks, and approximate months between two dates, with UTC-anchored math that avoids DST off-by-one bugs and a clear include/exclude toggle for the end date.
2026-08-14 - New: a date calculator that doesn't overflow past month-end
Add or subtract days, weeks, months, or years from any date — with month-end overflow clamped instead of silently rolling into the next month.
2026-08-14 - New: a Countdown Timer you can actually share
Pick any future date and time and watch a live countdown to the second — the target is saved right in the URL, so the link you share shows the same countdown.
2026-08-14 - New: a business days calculator that handles your own holiday list
Count working days between two dates, excluding weekends and any holidays you add — both endpoints included in the count.
2026-08-14 - New: an age calculator that does real calendar math
Get your exact age in years, months, and days using proper calendar-aware math, plus a countdown to your next birthday — with an explicit, documented rule for February 29 birthdays.
2026-08-14