<p>You were close! The difference changes when the Julian calendar has a leap day which the Gregorian calendar doesn't: 2100-02-29 old style or 2100-03-14 new style.</p>

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2021-08-28T13:41:37.510Z
2021-08-28T13:41:37.510Z
Mike G
<p>I'm trying to solve this task:</p>
<blockquote>
<p>In the twentieth century, the difference between the dates of the old and the new style was 13 days. From what date on the new style will this difference be 14 days?</p>
</blockquote>
<p>I thought that is from the first of March of 2100, since this year is considered as a leap year according to a Julian calendar and is not considered as a leap year according to Gregorian calendar. But this is the wrong answer. So my question is: why?</p>

<time>
When the difference between the dates of old and new style becomes 14?
ALiCe P.
# When the difference between the dates of old and new style becomes 14?

(Asked by: username_0 on 2021-08-28)

I'm trying to solve this task:

> In the twentieth century, the difference between the dates of the old and the new style was 13 days. From what date on the new style will this difference be 14 days?

I thought that is from the first of March of 2100, since this year is considered as a leap year according to a Julian calendar and is not considered as a leap year according to Gregorian calendar. But this is the wrong answer. So my question is: why?

**Tags:** time

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## 1 answers

### Answer by username_1 on 2021-08-28. Score: 3 | Accepted answer

You were close! The difference changes when the Julian calendar has a leap day which the Gregorian calendar doesn't: 2100-02-29 old style or 2100-03-14 new style.


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