In his book, Einstein's Dreams, Alan Lightman describes time as having three dimensions:
"Just as an object may move in three perpendicular directions, corresponding to horizontal, vertical, and longitudinal, so an object may participate in three perpendicular futures. Each future moves in a different direction of time" (22).
Lightman describes the possibility of time as one's own perception. He distinguishes those who follow 'body time' as different from everyone else who follows mechanical time. Time runs differently for people who disregard mechanical time, which is unyielding, and listen to their own body time:
"They do not keep clocks in their houses. Instead, they listen to their heartbeats. They feel the rhythms of their moods and desires. Such people eat when they are hungry, go to their jobs at the millinery or the chemist's whenever they wake from their sleep, make love all hours of the day. Such people laugh at the thought of mechanical time. They know that time moves in fits and starts. They know that time struggles forward with a weight on its back when they are rushing an injured child to the hospital or bearing the gaze of a neighbor wronged. And they know too that time darts across the field of vision when they are eating well with friends or receiving praise or lying in the arms of a secret lover" (Einstein's Dreams, p. 24-25)
But is it more than our perception? Could time really move differently depending on the closer one aproaches the speed of light? According to Einstein, it can and it does. Play the light speed game.
Or check out the dream of time standing still. Go to "the clock"
How does it relate?
The string theory proposes multiple dimensions. Perhaps some of these dimensions involve time. After all, time opens up a whole new aspect of dimensionality.