排期走势图
可视化各类签证截止日期的历史变化轨迹。
How to Read the Chart
Smooth Trend Lines
Each colored curve tracks a country's cut-off date over time. The higher the line, the more recent the cut-off — meaning faster queue movement.
Gradient Area Fills
The colored shading under each line shows the overall coverage. Wider fill means the cut-off is further advanced. Toggle countries on/off using the legend buttons.
Current (C) — Green Zone
Lines touching the green dashed line at the top mean the country is Current — anyone in that category can file regardless of priority date.
Unavailable (U) — Gaps
Breaks in a line with a red U badge indicate periods where the category was Unavailable — the annual visa quota was exhausted.
Retrogression Rings
Dashed red circles around data points mark months where the cut-off date moved backward. The tooltip shows the exact number of days lost.
Stats Ribbon
The bar above the chart shows computed insights: average monthly advance, best/worst single month, frozen/unavailable count, and net movement over the period.
Time Range Selector
Use the 6M / 12M / All buttons to zoom into recent months or view the full 21-month history. Shorter ranges reveal recent acceleration or slowdowns.
Interactive Tooltip
Hover (desktop) or tap (mobile) any point to see the exact cut-off date and month-over-month movement for all countries with ▲ advance / ▼ retrogression indicators.
Disclaimer: Historical data is for reference. Past movement does not predict future dates. Dates can advance, freeze, or retrogress unpredictably.
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