Countdown calculator
Countdown calculator
Days, hours, minutes and seconds left until a date and time you choose, counted from now or from a moment you type in.
How this is calculated
One instant minus another, in milliseconds, split into days, hours, minutes and seconds. Whole days drop the remainder; total hours keep the fraction, so the two describe the same span.
- Left blank, the start is your own clock and the figure updates every second. Enter a start moment instead and the answer stops moving, which is what you want when the deadline is fixed but the reading of it is not.
- A target already past is shown as time gone rather than a negative countdown, because the two questions are different.
Days, hours, minutes and seconds to a moment you choose, counted from the clock you are reading this on — or from a fixed moment you type in, so the figure stops moving.
The number moves, and says where it started
Left alone, the count runs against your own clock and redraws every second. The line under it prints the exact moment it was measured from, because a countdown without a stated origin is a claim rather than a calculation.
Enter a start date and the count freezes at that instant. That is the useful setting when the deadline is fixed but the reading of it is not: a notification issued at four in the afternoon, a form that closed yesterday, a result published before you looked.
Whole days, weeks and total hours are one number three times
The whole-day line drops the remainder, the week line groups sevens, and the hours line keeps the fraction to two decimals. All three are the same interval, and they are printed together so that a figure quoted to someone else can be given in the unit they asked for without being recalculated.
Questions readers ask
It says the moment has gone. Is that an error?
No. A target in the past is reported as time gone rather than as a negative countdown, because the two questions — how long until, and how long since — have different answers in every unit but one.
Which time zone is the target read in?
Your own. The date and the clock time are put together as one local moment, which is what a deadline on a notice means for the person standing in front of the counter. For a moment that belongs to another country, the time zone page converts it first.
Why does the seconds line change after I stop typing?
Because this is the one tool on the desk that redraws itself: a countdown that froze would be wrong within a minute and would say so confidently. Everything else on the desk waits for a keystroke.
More in Time, dates and shifts
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