do all modern clocks still write number four as IIII instead of IV

No, most modern clocks write the number four as "IV" rather than "IIII." The practice of writing "IIII" for the number four is mostly historical and not commonly used in the design of contemporary clocks.

Here are a few points to consider:

1. Standard Representation: "IV" is the standard Roman numeral for four. Clocks designed today typically follow this standard form.

2. Historical Practice: Some historical clocks, especially sundials or older timepieces, might have used "IIII" due to the reasons mentioned earlier about avoiding the association with the god Jupiter.

3. Modern Design: In current clock designs, whether mechanical, digital, or analog, "IV" is the most commonly used representation for the number four.

4. Exceptions: There may still be a few rare instances where you see "IIII" on specific timepieces designed to mimic historical styles or for decorative purposes, but it's not a standard practice.

In summary, the vast majority of modern clocks represent the number four as "IV" in accordance with standard Roman numeral usage. The use of "IIII" is limited to very specific historical contexts or design choices.