Date & Time
Days-Since / Sobriety Counter
Track how many days, weeks, months, and years have passed since any date. Perfect for sobriety, quit dates, anniversaries, and personal milestones.
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Date arithmetic
Counting days between two dates requires accounting for calendar complexity: varying month lengths, leap years, and time zones. The Julian Day Number (JDN) is a continuous count of days from noon on January 1, 4713 BCE, used in astronomy and date calculation software to simplify difference calculations.
Use cases for tracking days since an event
- Sobriety trackers: Counting days since last drink/cigarette provides tangible progress feedback.
- Relationship milestones: "Days since we met" or "days since our wedding."
- Project tracking: Days since project kickoff, days since last incident, days since last deployment.
- Personal challenges: Streak counters (e.g., "30-day workout challenge," "no social media for 100 days").
- Historical reflection: "How long has it been since [major life event]?"
Milestone suggestions
| Days | Approximate time | Milestone |
|---|---|---|
| 7 | 1 week | First week milestone |
| 30 | ~1 month | One month streak |
| 90 | ~3 months | Quarterly milestone |
| 100 | ~3.3 months | Triple-digit milestone |
| 365 | 1 year | One-year anniversary |
| 500 | ~1.4 years | 500-day milestone |
| 1000 | ~2.7 years | 1,000-day milestone |
| 10000 | ~27.4 years | 10,000-day milestone |
Calculation note
This tool calculates whole calendar days (midnight-to-midnight UTC) between the start date and today. It does not count partial days or hours. If you need precise duration including hours/minutes, use a duration calculator with time-of-day inputs.