Return the necessary inputs for function NewGetMetricDataInput points period now() ↓ ↓→ ←↓ ↓ [(startTime)............................(endTime)] → time https://docs.aws.amazon.com/AmazonCloudWatch/latest/APIReference/API_MetricStat.html this function calculate the right startTime, endTime and period from a time.Time and string period as a parameter using the p (period as string) and the t (time.Time) this function calculate the startTime and endTime as a multiple of the period.