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the 30th or 31st, the day-of-year number is 29 February, and the month length is 28 days. The result is a single shifted date with its weekday, its ISO form (Y-MM-DD) and the total net movement in days. The 30th or 31st, the day-of-year number is 29 February, and the month length is 28 days. The result is a single shifted date with its weekday, its ISO form (Y-MM-DD).For example,For example,For a worked example, start on Friday 15 August 2025 and add 90 days: the tool returns Thursday 13 November 2025, day 317 of the year, a net shift of +90 daysFor example,For a worked example, start on Friday 15 August 2025 and add 90 days: the tool returns Thursday 13 November 2025, day 317 of the year, a net shift of +90 daysFor example,For a worked example, start on Friday 15 August 2025 and add 90 days: the tool returns Thursday 13 November 2025, day 317 of the year, a net shift of +90 daysFor example,For a worked example, start on Friday 15 August 2025 and add 90 days: the tool returns Thursday 13 November 2025, day 317 of the year, a net shift of +90 daysFor example,For a worked example, start on Friday 15 August 2025 and add 90 days: the tool returns Thursday 13 November 2025, day 317 of the year, a net shift of +90 daysFor example,For a worked example, start on Friday 15 August 2025 and add 90 daysFor example, start on Friday 15 August 2025 and add 90 daysFor example, start on Friday 15 August 2025 and add 90 daysFor example,For a worked example, start on Friday 15 August 20