Visualize how much of the current year, quarter, month, and week has elapsed.
How far through the year are we, really? This tool places any date inside four nested periods - the year, the quarter, the month, and the week - and returns each one's elapsed percentage plus days remaining. Every figure is a simple ratio: position within the period divided by the period's length in days. The denominators are what vary: 365 or 366 days for the year, 90 to 92 for quarters, 28 to 31 for months. The surprise most users hit: the current day counts as elapsed, so January 1 reads about 0.3 percent, not zero, and quarter lengths are not equal - they run 90 to 92 days.
A concrete input and expected output from the current implementation.
Input
2026-10-22
Expected output
Year: 80.8% elapsed, 70 days remaining. Quarter (Q4): 23.9% elapsed, 70 days remaining. Month (October): 71.0% elapsed, 9 days remaining. Week: 57.1% elapsed (Thursday, day 4 of 7, weeks counted from Monday).
October 22, 2026 is day 295 of a 365-day year, so 295/365 = 80.82%; it is day 22 of the 92-day fourth quarter (22/92 = 23.91%) and day 22 of October's 31 days (22/31 = 70.97%). Q4 ends on December 31, which is why year and quarter both show 70 days left. The date is a Thursday, so the week figure assumes Monday-start weeks; a Sunday-start calendar would show day 5 of 7, about 71.4%. The day counts as fully elapsed, so a moment-based tool would read between 80.5% and 80.8% during October 22.
Each percentage is a ratio: a date's position in a period divided by that period's length in days. Position counts day of year, day within the quarter, day of month, or day of week. Lengths are the calendar lengths, which differ: 365 or 366 days in the year, 90 to 92 in a quarter, 28 to 31 in a month, always 7 in a week.
Days remaining are the period length minus the current day, so the two readings always reconcile: 295 elapsed plus 70 left equals the 365 days of 2026. The current day counts as elapsed, not remaining, which is why readings step at midnight rather than the evening before, and why a date never shows 100 percent until its final day begins.
Because the day you are in counts as elapsed. January 1 is day 1 of 365, so the year opens at 1/365, about 0.3 percent, and reaches 100 percent at the start of December 31 rather than at the stroke of midnight. Read every figure as 'done by the end of today.'
The tool uses the date and time from your own device, so the percentages reflect your local clock; two people at the same moment in different time zones can see different readings near midnight. Computation happens in the browser on your machine, and no date, time, or other data is sent anywhere.
The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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