Not sure if anyone else has had this come up but I've found that if the year is missing from a date (ie only the day and month are known & entered), when the gedcom is converted UncleGed puts in the current year.
Here's a section of the .ged:
1 NAME Joyce /****/
1 SEX F
2 DATE 30 NOV
1 FAMS @F355@
0 @I526@ INDI
and here's what it converts it to (I've put in *** for the last names as they're still alive):
Bradley *****, son of **** , was born 29 March 1958.
He married Joyce **** 19 May 1990.
Joyce **** was born November 2010.