Time calculators
Time duration
Find the hours, minutes and seconds between two clock times.
Your calculation
Hours : minutes : seconds
8:30:00
8.5 decimal hours
09:00 – 17:30
The breakdown
AT A GLANCE- Hours
- 8.5
- Minutes
- 510
- Seconds
- 30,600
- Day boundary
- Same day
Clock arithmetic only; time zones and daylight saving are not applied.
Good to know
Can I calculate overnight shifts?
Yes. Select “End on the next day” to count across midnight. For example, 22:00 to 06:00 on the next day is eight hours.
DATES & HOLIDAYS
Calendar
A year at a glance: public holidays, week numbers, moon phases and Norwegian tyre dates. Select two dates to explore a duration.
Calendar settings
SELECT A RANGE
Holidays in view
Your calendar, on paper
Every layout and option is free. No account, watermark or required logo.
Create a PDF calendar
Monthly layouts start on the first of the chosen month. Weekly and daily layouts use both dates, up to 366 days.
PDF holidays, moon time zone and tyre region follow your calendar settings. The appendix preserves full event titles and notes.
One page: calendar above, holidays, moon phases, tyre dates and personal events below. Up to 12 months. Choose larger paper or fewer details if the page is too full.
Personal events & browser storage 0
Saved only in this browser. Clearing browser data removes saved calendars. Download a backup to keep a copy or move to another device. Personal events are not included in shared calendar links.
No personal events yet.
Import merges events by identifier and restores the backed-up settings and logo. Maximum 500 personal events.
Holiday rules, history & sources
Dates use the Gregorian calendar extended to years 0001–9999. Before 1995, these are rule projections, not a verified historical holiday calendar. Earlier Julian calendars and Sweden’s calendar transitions are not reconstructed. UK published dates cover 2019–2028, including one-off holidays; outside that window UK dates are recurring-rule projections without exceptional holidays. Future projections assume the laws remain unchanged; published UK years take precedence.
Known changes included: Norway’s 1 and 17 May from 1947; Denmark’s Store bededag from 1686 through 2023; Sweden’s National Day replaces Whit Monday from 2005. Other pre-1995 rules are projected. Sundays are shown as weekends; the holiday list names specific holidays. Christmas Eve, New Year’s Eve, Swedish Midsummer Eve and Danish Constitution Day are not counted as national public holidays. Denmark covers Denmark proper, not Greenland or the Faroe Islands.
Working days mean Monday–Friday minus distinct public-holiday dates. Weekends are not deducted twice. UK bank holidays use their published or calculated substitute weekdays; Nordic holidays are not shifted to Monday. Employment agreements can provide other days off.
Sources checked .
- GOV.UK bank holidays · Open Government Licence v3.0. Includes public sector information licensed under OGL v3.0.
- Norwegian Public Holidays Act · 1 and 17 May
- Danish public holidays · Store bededag abolition
- Swedish Public Holidays Act · 2005 holiday change
Region suggestions use only your browser language and time zone. They are approximate. Explicit choices are stored on this device; shared links take precedence. No GPS or IP-location service is used. Dates and numbers follow your selected language.
Moon phase calculations: Astronomy Engine, MIT licence. Phase times are approximate and calculated on your device; dates follow the chosen moon time zone.
Flag images: flag-icons, MIT licence. UK regions are named explicitly; the UK flag is used for England & Wales and Northern Ireland.
World clock
Current time around the world. Choose time zones to compare their clocks, local dates and UTC offsets.
All tools
Calendars, clocks and calculators. Find the tool you need.