Digging times

the best digging times as I recall them are

(server time)
2:00pm-4:30pm Common
4:30pm-5:00pm Common/Uncommon***
5:00pm-6:30pm Common
6:30pm-7:00pm Rare
7:00pm-8:30pm Common
8:30pm-9:00pm Uncommon
9:00pm-10:00pm Common

All other time periods tend to be completely random

*** This is a dig time, where Uncommon artifacts are found at a much higher rate then normal, and are mixed in with the common artifacts that are found during this period.

9pm to 10pm (server time) also seems pretty good for commons, with an occasional uncommon

i didn`t realize the 5am-8am dig time.. thanks apollo..

Digging Time (GC Server Time)

Dig times (server time)
2-6:30 pm: Very good for commons, 1 in 20 is a rare or uncommon
6:30-7 pm: Rares
7-8:30 pm: Good for commons
8:30-9 pm: Uncommon
12:50-2:30am: OK for commons
5am - 8am: Good for commons couple of rares and uncommons too