Time Progress reads the device's current time about every 250 ms and computes the percentage of today, this week, this month and this year that has already passed. A week is taken to start on Monday. After a birth year is entered it also draws a life-in-weeks grid at “life expectancy × 52 weeks”, marking the weeks already lived, the current week and the future.

1. 01Read the four live progress figures for the day, week, month and year, and the days left in the year.
2. 02You can enter a birth year from 1900 to the current year and set a life expectancy of 50–120.
3. 03Clicking save long image loads html-to-image on demand and renders the current local content as a 2× PNG download.

The life grid estimates a fixed 52 weeks per year, so the total is life expectancy × 52; the weeks lived are counted from 1 January of the birth year, which means it is not an exact count from a birthday or an accounting of leap weeks.

• Every percentage depends on the device clock and the local time zone; a wrong system time shows up directly in the results.
• The year progress uses the real millisecond difference between the start of this year and the start of the next, so it adapts to leap years, while the life grid is a fixed 52 weeks per year as a visual approximation.
• Only a birth year is entered; no specific birthday, health status or individual life prediction is handled.
• The life expectancy is a display scale the user chooses and must not be read as a medical prediction.
• The birth year and life expectancy are written to localStorage.

The time calculations and the PNG generation both happen locally in the browser; the birth year and life expectancy preferences are stored on this device and are never uploaded.