Use what Ripsnort said.
.time 20 00 00 where 20 is the hours (military time), 00 is minutes, and 00 is the multiplyer (it will stay dark till you change it)
Increasing the final number makes the sun move faster. I've had it set as high as 80 in HTH games, and it sure cycles fast

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Mark VanZwoll
33rd Strike Group