Enter a date and see how many days have passed: since a diet started, since you quit, since the first day of a new job. If it is meant to last a set time, give the plan and the counter says how many days are left and how far along you are. No account, nothing sent to our server.
The starting day is zero, so yesterday reads one. A three month plan is 90 days, taking a month as 30, so that "three months" and "90 days" mean the same thing here.
Where these numbers come from: How many days has it been? Counting from a date, and why the counter works
Subtract the start date from today. The starting day counts as zero, so something that began yesterday has lasted one day. The calculator does it for you, leap years included.
Ninety here, taking a month as 30 days. Three calendar months run from 89 to 92 days depending on which months they are.
Not on this page: the date stays in your browser for the visit. An Ordiarion account has a counters module that keeps them on every device and shows the progress of a plan.
The direction. A countdown counts to a date ahead: the holidays, Christmas. This counts from a date behind: since a diet started, since you quit, since you moved.