What time zone is used by astronauts at the International Space Station?

So GMT then

GMT with more precise, modern computer oriented focus.

Birdman, Zulu is the (Western) military designation for UTC/GMT. UTC +1 is Alpha, +2 Bravo --- +12 Mike (Juliet is skipped) UTC -1 November, -2 Oscar --- -12 Yankee

This is sometimes called Zulu time.

Red England, GMT does not change the countries that use it change to +1 etc but it GMT remains the same

Maestro1313, Agreed. Who the heck wrote this question

So why can't my phone, computer, and GPS coordinate?

Stormy, GMT changes twice a year for daylight saving