From the last Sunday of March to the last Sunday of October, at 12 noon PST, it's 11 PM EEST in Bulgaria. During the rest of the year, at 12 noon PST, it's 10 PM EET in Bulgaria.
(Between the 1st Sunday of April and the last Sunday of October, PST only stands for Pitcairn Standard Time, because Pacific Standard Time is not in use anywhere during that period. Pitcairn Standard Time is the same time as Pacific Standard Time.)
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