時差 is read as じさ (jisa) and means time difference.
じさ
jisa
じさぼけ
jet lag
じさしきしんごう
fixed-time traffic lights
じさしんごう
ときおり
sometimes
じかんわり
timetable (esp. a weekly school timetable)
じき
time
じそく
speed (per hour)
じげん
(school) period
じこく
opportunity
じきゅう
hourly pay
じほう
announcement of time