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Go back in time by centuries. Enter a number of centuries and find the exact historical date, with conversions to years, decades, and days.

Find any date in the past by decades. Enter a number of decades and see the exact date, plus conversions to years, months, and days.

Calculate any future date by decades. Enter a number of decades and see the exact future date, plus conversions to years, months, and days.

The IRA limit's evolution from creation in 1974 until 2026. Includes key laws on how the IRA works for individuals and spouses, plus age 50+ catch-up.

The 401(k) limit's evolution from 1978 until 2026. We include the key laws changing how the 401(k) works for individuals and employers and 50+ catch-ups.

The history of the Health Savings Account limit (HSA) from 2004 until 2026, including age 55+ catch-ups, family limits, and health plan restrictions.

Interactive 3D treasury yield curve chart from 1990 to today. See inversions, recessions, and rate changes. Animated timeline, daily updates.

Compare real household income growth by percentile from 1968-2025. See how dual-earner households, shrinking family sizes, and assortative mating changed the picture.

Compare US real income growth by percentile for any range from 1962-2025. Test the 'all gains went to the top' claim with Census Bureau data.