Week counting in Jira

[SSunduk]

Condition! In applications for a project and one type of task, it is necessary to update the "Week number" field (number field), if project = UKS AND issuetype = "Written requests from clients" AND "Minutes date" != 0, then you need to count the weeks from the beginning of the year and update the field "Number of the week". What select (Groovy) and how to make this rule correctly.
Thank you.