日付間隔計算機

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About Date Duration Calculator

Calculate the precise duration between two dates. Perfect for age calculations, project planning, event countdowns, or any date-based measurements.

Key Features
  • Calculate duration in years, months, and days
  • Total time in multiple units (days, weeks, hours)
  • Instant calculation with detailed breakdown
  • Human-readable format output
How to Use
  • Select or enter the start date
  • Select or enter the end date
  • Click "Calculate" to see the duration
  • View results in multiple formats
Enter the starting date
Enter the ending date

Select dates and click Calculate to see the duration

Common Use Cases

Age Calculation

Calculate exact age in years, months, and days from birth date to current date.

Project Duration

Calculate total project duration from start to end date for planning and reporting.

Event Countdown

Calculate days remaining until important events, deadlines, or milestones.

Employment Duration

Calculate work tenure for experience tracking or benefits calculation.

Subscription Period

Calculate subscription duration for billing or renewal planning purposes.

Historical Analysis

Calculate time elapsed between historical events for research or documentation.