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Time structure is defined as
Jira Legacy showSummary false server JIRA (atomiton.atlassian.net) serverId 6675b638-29d6-3b8e-81c0-6089f01f08ad key TQLDOC-7
Year: YYYY (eg 1997) Year and month: YYYY-MM (eg 1997-07) Complete date: YYYY-MM-DD (eg 1997-07-16) Complete date plus hours and minutes: YYYY-MM-DDThh:mmTZD (eg 1997-07-16T19:20+01:00) Complete date plus hours, minutes and seconds: YYYY-MM-DDThh:mm:ssTZD (eg 1997-07-16T19:20:30+01:00) Complete date plus hours, minutes, seconds and a decimal fraction of a second YYYY-MM-DDThh:mm:ss.sTZD (eg 1997-07-16T19:20:30.45+01:00)
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The example above indicates a period of minus 10 days.