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You should celebrate your birthday every year!
Hebcal uses the anniversary algorithm defined in Calendrical Calculations by Edward M. Reingold and Nachum Dershowitz, which accords with Ashkenazic practice. Reingold and Dershowitz write:
Someone born on the thirtieth day of Marcheshvan, Kislev, or Adar I has his birthday postponed until the first of the following month in years where that day does not occur. [Calendrical Calculations p. 111]
In other words, on years where there is no 30th of Kislev, your birthday is celebrated on the 1st of Tevet.
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You should celebrate your birthday every year!
Hebcal uses the anniversary algorithm defined in Calendrical Calculations by Edward M. Reingold and Nachum Dershowitz, which accords with Ashkenazic practice. Reingold and Dershowitz write:
In other words, on years where there is no 30th of Kislev, your birthday is celebrated on the 1st of Tevet.