Days-Since / Sobriety Counter

How to use this tool

1. Enter a name for your counter (e.g. "Quit Smoking").
2. Pick the start date.
3. See elapsed days, weeks, months, and years instantly.
4. Add more counters as needed - all saved locally in your browser.

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

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.