Jenkins groovy script: get all builds started during a specific time

script.groovy

// This example lists all job that were started on Jul 16, 2019 between 1:20 PM and 2:30 PM

String df = 'MMM dd, yyyy h:mm a'

long startTimestamp = Date.parse(df, 'Jul 16, 2019 1:20 PM').getTime()
long endTimestamp = Date.parse(df, 'Jul 16, 2019 2:30 PM').getTime()

Jenkins.instance.getAllItems(AbstractItem.class).each {
  builds = it.getBuilds().byTimestamp(startTimestamp, endTimestamp)
  if(!builds.isEmpty()) {
    println(it.fullName)
    println(builds)
  }
}

return null