Comparing values to same period last year

tWdex , Best is to create a date table and compare using measures 

measures 

Current = sum(Table[hours])

Year behind hours= CALCULATE([Current ],dateadd('Date'[Date],-1,Year))
Year behind hours= CALCULATE([Current],SAMEPERIODLASTYEAR('Date'[Date]))

Power BI — Year on Year with or Without Time Intelligence
https://medium.com/@amitchandak.1978/power-bi-ytd-questions-time-intelligence-1-5-e3174b39f38a
https://www.youtube.com/watch?v=km41KfM_0uA

To get the best of the time intelligence function. Make sure you have a date calendar and it has been marked as the date in model view. Also, join it with the date column of your fact/s. Refer :radacad sqlbi My Video Series Appreciate your Kudos.