Contestants are isolated from the outside world, and have no access to any time references.

When we want to state a fact or ask a question without any time reference, we use the present simple tense.

The message's time reference could mean that we have less than a six-hour window.

Bali, for instance, has a rather precise system of time reference.

Here either the condition or the consequence, but not both, has a past time reference.

In their own time reference that was just about 1/2 speol.

That is, they might arguably mark time reference, but not yet systematically.

These people are listed below to provide a partial geographical and time reference for use of this name.

And this is also only clocks that actually get their time reference from the power line.

We kept the name century in the title to give us the time reference and point out that we're still forward looking.