---
id:
aliases: []
title: 2026-02-04 19:35:00
tags:
  - authorship/original
  - destiny/permanent
  - status/draft
  - type/timestamped
dg-publish: true
daily: "[[2026-02-04]]"
---
# 2026-02-04 19:35:00

## Time Interval Conversion

In [[2026-01-09#2026-01-09 12:00]]
I defined time intervals according to averages
which are true of the Gregorian calendar for $\lim\limits_{t\to\infty}$,
but which are not so appropriate for a human lifetime scale.

True of the Gregorian calendar (and its predecessors)
for all time scales:

$$
\begin{align*}
1~\text{Year} &\equiv 12~\text{Months} \\
1~\text{Week} &\equiv 7~\text{Days}
\end{align*}
$$

In 2001--2099 leap years occur exactly once in four years.

$$
\begin{align*}
1~\text{Year} &= 365.25~\text{Days} \\
\end{align*}
$$
