You will begin to count the days to determine if you meet the substantial presence test on the first day of the sixth calendar year (2018). The IRS has a good example of how to calculate it here: IRS Substantial Presence Test.
It sounds to me like you are a resident beginning in 2018 (so long as you were present at least 183 days in 2018) but I am not certain that I have all of the pertinent facts.
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