Who knows two hundred three?
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In a "deficient" Jewish year (353 days in a regular year or 383 in a leap year), there are 7 "deficient" months of 29 days each. Thus, 203 days of such a year are in "deficient" months.
In Gematria there are interchangeble letters. They are known as AT = Aleph Tof, BASH = Bais Shin, GAR = Gimel Raish, DAK = Daled Kuf, etc.
Gar = 203
Gar, The third day of Pesach (Gimel) will be the first day of the coming Rosh HaShana (Raish)