Inyan Shel Zman (Hebrew: עניין של זמן) or A Matter of Time is an Israeli teen drama broadcast from 1992 until 1996 on Israeli Educational Television.

The series focused on stories of high school students in Tel Aviv and talked about issues of adolescents such as school, adolescence, love, drafting to the army, social gaps, rape, violence and more. The series would focus in each episode on various secondary characters and show their world and their problems, in addition to the central plot which evolved around the main characters.

The series was directed Yael Graph and Shirley Stern, was written by Ronit Weiss Berkowitz and Eyal Graph.

The theme song to the series was written by Ehud Manor, composed by Rami Kleinstein and was performed by Gidi Gov.

In the years 1998-1999 a spin-off to the series was produced called "Esrim plus". The show ran for 2 seasons.

In 2010 Reshet announced a continuation of the series would be produced.. The revived show, which premiered in 2012 under the same name, revisits many of the characters from the original series, 20 years later. This show ran for one season consisting of 13 episodes.