Daylight saving time, or summer time In many countries outside the tropics the clocks are advanced during the winter months to give more daylight in the evenings In Tide Wizard the time setting will be flagged with DST if daylight saving time has been selected by the user, even if there are no daylight saving time rules for that location, or the dates are such that daylight saving time is not applied
Drill Stem Test A downhole test of the productive capacity of a well through drill pipe up to the surface to obtain samples of gases and fluids and determine their rate of sustained flow