Intervals

y2023 <- ymd("2023-01-01") %--% ymd("2024-01-01")
y2024 <- ymd("2024-01-01") %--% ymd("2025-01-01")
y2023 / dyears(1)

## [1] 0.9993155

y2023 / days(1)

## [1] 365

y2024 / dyears(1)

## [1] 1.002053

y2024 / days(1)

## [1] 366