The Narcotics Anonymous Cleantime Calculator uses the same formula we always use when we calculate cleantime in N.A. meetings, and assign keytags:
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If the person has 0 or more days, they should have a white key tag.
If the person has 30 or more days, they should have an orange tag.
If the person has 60 or more days, they should have a green tag.
If the person has 90 or more days, they should have a red tag.
At this point, we start measuring by months.
If the person has 6 or more months, they should have a blue tag.
If the person has 9 or more months, they should have a yellow tag.
If the person has 12 or more months (one year), they should have a glow-in-the-dark tag.
If the person has 18 or more months (a year and a half), they should have a gray tag.
At this point, we start measuring by years.
If the person has two or more years, they should get a black tag for each year more than one. At this point, we start measuring by decades.