Gantt Charts for Structure allows you to define the precision used for scheduling and calculations. You can choose 1 minute, 1 hour, or 1 day precision (1 hour is used by default).
Precision defines the minimum meaningful amount of work. All date, time, and duration values in your chart are rounded according to the selected precision. When rounding for precision:
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Start dates are rounded down
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Finish dates and durations are rounded up
For example, with the default 1 hour precision, a duration of 15 minutes will be displayed in your chart as 1 hour. A Start Date of September 12, 2022 9:45 AM would be shown as September 12, 2022 9:00 AM.
Gantt Charts rounds the value of Jira fields when doing calculations, but the field value itself is not updated.