The phrase "bus eller godis" translates to "trick or treat" and refers to a Halloween tradition where children go door to door asking for candy or playful tricks. In Sweden, this tradition is relatively new and not tied to a fixed day as it is in the US. Halloween is always on October 31, but Swedish practice varies: some children go "bus eller godis" on Halloween itself, while others do it on the Friday before "Alla helgons dag" (All Saints' Day), which falls between October 30 and November 5. The choice of day depends on local customs, practicality like school holidays, and community agreements. Many families prefer going on a Friday evening for convenience and to avoid a weekday disruption. It's common to look for Halloween decorations as a signal that a household welcomes visitors on "bus eller godis" night. Time-wise, early evening (around 17:00–20:00) is typical.

So, the answer to your question about "bus eller godis vilken dag" [bus eller godis vilken dag](javascript:void(0)) is that it is most commonly celebrated either on October 31 (Halloween) or the Friday before All Saints' Day, depending on local tradition and convenience in Sweden.