Dutch word tijdlijn comes from Dutch lijn, Dutch tijd ((grammar) tense. Time.)

Detailed word origin of tijdlijn

Dictionary entry	Language	Definition
lijn	Dutch (nld)	(chess) file. (geometry) a line. (usually, _, diminutive, slang) a line of drugs in powder form. A rope, a cable. A route.
tijd	Dutch (nld)	(grammar) tense. Time.
tijdlijn	Dutch (nld)	Timeline.