Countdown Calculator

This calculator measures the raw gap between right now and the target date and time you build from Month, Day, Year, and an optional Hour, then takes the absolute value of that gap before reporting it (line 17) -- so a date that's already passed still produces a positive Total Days figure rather than a negative one, and Status is the only place that tells you whether the target is upcoming or behind you. Total Days, Total Hours, and Total Minutes are all derived from the same millisecond gap, each floored down to a whole unit (lines 19-22); Total Weeks and Approx Months are rounded to one decimal place instead, and Approx Months divides by 30.44 -- the average length of a month across a year -- rather than counting actual calendar months, so it will drift slightly from what you'd get counting month-by-month on a calendar. Work Days is an estimate, not an actual weekday count: it multiplies Total Days by five-sevenths (line 31), the fraction of a week that's a weekday, rather than walking the calendar and checking which specific dates fall on a weekend the way the Business Days Calculator does.

Sleeps is simply Total Days again, presented as a second output for the same number (line 34). Target Month has the largest effect on how many days remain of the four inputs: picking a different month can swing the target date anywhere from a few days away to the better part of a year away, while Target Day only shifts the date within its month and Target Year -- despite moving the target by whole years -- changes the reported day count by a smaller share of it, since the count is already large once the target is years out. Leaving Hour at its default treats the target as the very start of the day.