Relationship Duration Calculator
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For entertainment and self-reflection only. Not scientific, medical, financial, or relationship advice.
Start date and end date → exact time together in years, months, and days.
Start & end date
Time together
6y 4m 18d
From 2020-03-20 to 2026-08-07
- Years
- 6
- Months
- 4
- Days
- 18
Related calculators
How long have you been together?
Relationship duration is calendar time from a start date (first date, commitment, marriage, or any milestone you choose) to an end date — usually today. The result breaks into full years, remaining months, and remaining days by walking the calendar, not by dividing total days by 365.
Leap years and varying month lengths are handled automatically. The end date must be on or after the start date. Change the end date to measure a past chapter instead of an ongoing relationship.
Example: together since March 20, 2020 through August 7, 2026 → 6 years, 4 months, 18 days. For a generic span between any two dates without relationship labels, use the date difference calculator.
Common questions
Which start date should I use?
Any milestone you agree on — first date, exclusivity, engagement, or wedding. The math is the same; the meaning is yours.
How is this different from the date difference calculator?
Same underlying calendar math. This page frames the result as time together; date difference is neutral for deadlines, contracts, and general spans.
Can I calculate a past relationship?
Yes — set the end date to the breakup or separation date instead of today to see how long the relationship lasted.