Date, calendar, and time zone reference
Date Time Encyclopedia
Date Time Encyclopedia gives direct date, calendar, business-day, time zone, timestamp, and country date-format answers.
Date Time Encyclopedia answer, with calculation details and assumptions below.
Use the site to compare date rules, calendar ranges, ISO weeks, time differences, timestamp concepts, and country date formats with explicit assumptions.
Snapshot
Date Time Encyclopedia
Date Time Encyclopedia gives direct date, calendar, business-day, time zone, timestamp, and country date-format answers.
Use the site to compare date rules, calendar ranges, ISO weeks, time differences, timestamp concepts, and country date formats with explicit assumptions.
- Date offsets
- Days, weeks, months, and business days
- Calendars
- Years, months, and ISO week ranges
- Time zones
- City pairs and abbreviation comparisons
- Formats
- Country date formats and Unix time
Method
Pages use Gregorian calendar rules, ISO week rules, IANA time zone identifiers, and explicit calendar-day or business-day assumptions.
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How to use this lookup
Date Time Encyclopedia is a hub for focused date and time lookups. Start with a specific route when you need an exact answer for a date, calendar, week, timestamp, or city-time question.
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FAQ
What can I calculate here?
You can look up relative dates, business-day offsets, calendars, ISO week ranges, city time comparisons, Unix timestamps, and country date formats.
Are business days holiday-aware?
Business-day pages currently skip Saturdays and Sundays only. Country-specific public holidays are not removed in this first version.