When a passage starts in one particular time and goes to another without warning?

When a passage transitions from one time period to another without warning, it is often referred to as a temporal jump or a time shift. This technique can create a sense of disorientation for the reader, emphasizing the contrast between the two time frames. It can also serve to highlight changes in character, setting, or theme, allowing for a deeper narrative exploration. Such transitions can be effective in conveying the impact of time on the story's events or characters.