Recipe calls for 1 cup water and 6oz chopped dates, how many oz of date syrup should I use instead?

For date syrup, 1 tbsp has about the same nutrients as 1 oz of dried dates, so I would use half the amount the recipe calls for.
If the water is to help puree the dates, omit at first, then add back in 1/4 cup units until you reach desired texture.