doctor who - Do Daleks Travel in Time?

Yes, they do travel through time, although in most episodes in a less sophisticated way than the Time Lords (as others, like Time Agents, do).

The Daleks envied the Time Lords' superior technology, and try to gain it for themselves. In "Remembrance of the Daleks" (7th Doctor) the Daleks try to steal the Hand of Omega, which could create a power source for (Time Lord style) time travel.

By the time of the Last Great Time War, Dalek time travel technology is perhaps as sophisticated as the Time Lords'. In particular, in Doomsday (10th Doctor) the Daleks are able to "emergency temporal shift" without (as far as we see) any external device, suggesting that the Dalek "travel machines" (their suits) incorporate some form of time travel device.

The Daleks sometimes use devices that create "Time Corridors" for travel rather than vessels like a TARDIS, for example:

In "The Chase" (1st Doctor), the Daleks are using ships (Vicki stows away on one when she gets left behind by the Doctor) that can time travel. Also with the 1st Doctor, in "The Daleks' Master Plan" we see the Daleks with time-travel capable ships (but not as sophisticated as the Doctor's or the Meddling Monk's).

In terms of how their choose their destination time, it differs with each of these stories. Generally the date and location have been chosen because they offer some opportunity to further the domination of the Daleks (sometimes, as in "The Evil of the Daleks", to improve their time travel technology and prevent anyone else having it). Presumably they have also travelled widely throughout time on occasions where the Doctor was not around to prevent it.