kalenderintervallen

Kalenderintervallen, or calendar intervals, are time spans defined by calendar units such as days, weeks, months, or years, used to organize time for analysis, scheduling, or reporting. They rely on the conventional calendar rather than a fixed numeric duration, making them intuitive for human planning and interpretation.

A key characteristic is that calendar intervals can have variable actual lengths: months range from 28 to 31 days, and years may be 365 or 366 days due to leap years. Weeks are typically seven days, but the week alignment can vary by culture or business practice. Time-zone differences and daylight saving time can also affect timestamps when intervals are not date-based alone.

Common calendar intervals include daily, weekly, monthly, quarterly, and yearly intervals, as well as fiscal calendar intervals that start on arbitrary dates. Some analyses group data by calendar quarters or by calendar months rather than by fixed blocks of a set number of days.

Applications span data analysis, financial reporting, budgeting, and project planning. In time-series analysis, calendar-based resampling aggregates data to the underlying calendar unit (e.g., totals per month or averages per quarter). In scheduling, calendar intervals align events with familiar periods, while in payroll or accounting, fiscal calendars may differ from the nominal calendar year.

Implementation considerations include handling leap years, time zones, and holidays when interval boundaries align with a business or social calendar. Many software tools support ISO weeks or other calendar systems to ensure consistent alignment across systems.