Siri give wrong date of birthday
Siri gives all the birthdays one day to soon. When someones birthday is on the 14th and we ask Siri when the birthday was, siri answers that it was yesterday even though the 14th is today.
The info in My contacts is correct. The timezone is CET. (Belgium).
iMac (Retina 4K, 21.5-inch, Late 2015), macOS Sierra (10.12)