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dates = pod_forecast["year"]*100 + pod_forecast["week"]
df['date'] = pd.to_datetime(dates.astype(str) + '0', format='%Y%W%w')
# This sets the date to Sunday end of week.
# To set it to a different date, subtract the desired number of days
# Eg.
pod_forecast['date'] = pd.to_datetime(dates.astype(str) + '0', format='%Y%W%w') - timedelta(days=6)
# This sets it to ISO-week with Monday as beginning of the week.