Why the EMA is calculated 1 day after the day SMA is calculated?

Hi friends,

I came across the calculation of EMA (Exponential Moving Average) on internet.
To start with, let’s have the following data points over a time of 5 days (10.1.2017 - 14.1.2017) for an "XYZ"
scrip. :
{ 101, 102, 103, 104, 105 }.
The SMA for 1st data point (105) is 103 (on 14.1.2017).
In all the examples that i came across, The EMA is calculated one day after the day when SMA is calculated, i.e. 17th onward (considering 15 and 16 Sat and Sunday). My question is that when all these
data points are closing prices, then why the EMA can’t be calculated the same day when SMA was calculated ?
In this case 14th itself ?