diff --git a/src/fix_dt_reset.cpp b/src/fix_dt_reset.cpp
index 60e9e0b449..79e9441f6b 100644
--- a/src/fix_dt_reset.cpp
+++ b/src/fix_dt_reset.cpp
@@ -46,7 +46,7 @@ FixDtReset::FixDtReset(LAMMPS *lmp, int narg, char **arg) :
   time_depend = 1;
   scalar_flag = 1;
   vector_flag = 1;
-  size_vector = 2;
+  size_vector = 1;
   global_freq = 1;
   extscalar = 0;
   extvector = 0;
@@ -89,7 +89,7 @@ FixDtReset::FixDtReset(LAMMPS *lmp, int narg, char **arg) :
 
   // initializations
 
-  t_elapsed = t_laststep = 0.0;
+  t_laststep = 0.0;
   laststep = update->ntimestep;
 }
 
@@ -98,7 +98,6 @@ FixDtReset::FixDtReset(LAMMPS *lmp, int narg, char **arg) :
 int FixDtReset::setmask()
 {
   int mask = 0;
-  mask |= INITIAL_INTEGRATE;
   mask |= END_OF_STEP;
   return mask;
 }
@@ -133,15 +132,6 @@ void FixDtReset::setup(int vflag)
 
 /* ---------------------------------------------------------------------- */
 
-void FixDtReset::initial_integrate(int vflag)
-{
-  // calculate elapsed time based on previous reset timestep
-
-  t_elapsed = t_laststep + (update->ntimestep-laststep)*dt;
-}
-
-/* ---------------------------------------------------------------------- */
-
 void FixDtReset::end_of_step()
 {
   double dtv,dtf,dtsq;
@@ -190,9 +180,9 @@ void FixDtReset::end_of_step()
 
   if (dt == update->dt) return;
 
-  t_elapsed = t_laststep += (update->ntimestep-laststep)*update->dt;
   laststep = update->ntimestep;
 
+  update->update_time();
   update->dt = dt;
   if (respaflag) update->integrate->reset_dt();
   if (force->pair) force->pair->reset_dt();
@@ -210,6 +200,5 @@ double FixDtReset::compute_scalar()
 
 double FixDtReset::compute_vector(int n)
 {
-  if (n == 0) return t_elapsed;
   return (double) laststep;
 }
diff --git a/src/fix_dt_reset.h b/src/fix_dt_reset.h
index 4679163291..f802f413ac 100644
--- a/src/fix_dt_reset.h
+++ b/src/fix_dt_reset.h
@@ -31,7 +31,6 @@ class FixDtReset : public Fix {
   int setmask();
   void init();
   void setup(int);
-  void initial_integrate(int);
   void end_of_step();
   double compute_scalar();
   double compute_vector(int);
@@ -41,7 +40,7 @@ class FixDtReset : public Fix {
   int minbound,maxbound;
   double tmin,tmax,xmax;
   double ftm2v;
-  double dt,t_elapsed,t_laststep;
+  double dt,t_laststep;
   int respaflag;
 };
 
diff --git a/src/respa.cpp b/src/respa.cpp
index a6f7e66029..42da6ccbf4 100644
--- a/src/respa.cpp
+++ b/src/respa.cpp
@@ -499,6 +499,7 @@ void Respa::cleanup()
   modify->post_run();
   modify->delete_fix("RESPA");
   domain->box_too_small_check();
+  update->update_time();
 }
 
 /* ---------------------------------------------------------------------- */
diff --git a/src/thermo.cpp b/src/thermo.cpp
index b51938635c..7c49b6c98b 100644
--- a/src/thermo.cpp
+++ b/src/thermo.cpp
@@ -45,7 +45,7 @@ using namespace MathConst;
 
 // customize a new keyword by adding to this list:
 
-// step, elapsed, elaplong, dt, cpu, tpcpu, spcpu
+// step, elapsed, elaplong, dt, time, cpu, tpcpu, spcpu
 // atoms, temp, press, pe, ke, etotal, enthalpy
 // evdwl, ecoul, epair, ebond, eangle, edihed, eimp, emol, elong, etail
 // vol, lx, ly, lz, xlo, xhi, ylo, yhi, zlo, zhi, xy, xz, yz, xlat, ylat, zlat
@@ -647,6 +647,8 @@ void Thermo::parse_fields(char *str)
       addfield("Elaplong",&Thermo::compute_elapsed_long,BIGINT);
     } else if (strcmp(word,"dt") == 0) {
       addfield("Dt",&Thermo::compute_dt,FLOAT);
+    } else if (strcmp(word,"time") == 0) {
+      addfield("Time",&Thermo::compute_time,FLOAT);
     } else if (strcmp(word,"cpu") == 0) {
       addfield("CPU",&Thermo::compute_cpu,FLOAT);
     } else if (strcmp(word,"tpcpu") == 0) {
@@ -994,6 +996,9 @@ int Thermo::evaluate_keyword(char *word, double *answer)
   } else if (strcmp(word,"dt") == 0) {
     compute_dt();
 
+  } else if (strcmp(word,"time") == 0) {
+    compute_time();
+
   } else if (strcmp(word,"cpu") == 0) {
     if (update->whichflag == 0)
       error->all(FLERR,
@@ -1447,6 +1452,13 @@ void Thermo::compute_dt()
 
 /* ---------------------------------------------------------------------- */
 
+void Thermo::compute_time()
+{
+  dvalue = update->atime + (update->ntimestep-update->atimestep)*update->dt;
+}
+
+/* ---------------------------------------------------------------------- */
+
 void Thermo::compute_cpu()
 {
   if (firststep == 0) dvalue = 0.0;
diff --git a/src/thermo.h b/src/thermo.h
index 36009ee627..168447f76f 100644
--- a/src/thermo.h
+++ b/src/thermo.h
@@ -122,6 +122,7 @@ class Thermo : protected Pointers {
   void compute_elapsed();
   void compute_elapsed_long();
   void compute_dt();
+  void compute_time();
   void compute_cpu();
   void compute_tpcpu();
   void compute_spcpu();
diff --git a/src/update.cpp b/src/update.cpp
index b502822c8b..ad58842937 100644
--- a/src/update.cpp
+++ b/src/update.cpp
@@ -38,6 +38,8 @@ Update::Update(LAMMPS *lmp) : Pointers(lmp)
   char *str;
 
   ntimestep = 0;
+  atime = 0.0;
+  atimestep = 0;
   first_update = 0;
 
   whichflag = 0;
@@ -356,6 +358,7 @@ void Update::reset_timestep(int narg, char **arg)
 
 /* ----------------------------------------------------------------------
    reset timestep
+   set atimestep to new timestep, so future update_time() calls will be correct
    trigger reset of timestep for output and for fixes that require it
    do not allow any timestep-dependent fixes to be defined
    reset eflag/vflag global so nothing will think eng/virial are current
@@ -371,6 +374,8 @@ void Update::reset_timestep(bigint newstep)
   if (ntimestep < 0) error->all(FLERR,"Timestep must be >= 0");
   if (ntimestep > MAXBIGINT) error->all(FLERR,"Too big a timestep");
 
+  atimestep = ntimestep;
+
   output->reset_timestep(ntimestep);
 
   for (int i = 0; i < modify->nfix; i++) {
@@ -400,6 +405,17 @@ void Update::reset_timestep(bigint newstep)
   //    error->all(FLERR,"Cannot reset timestep with a dynamic region defined");
 }
 
+/* ----------------------------------------------------------------------
+   update elapsed simulation time
+   called at end of runs or when timestep size changes
+------------------------------------------------------------------------- */
+
+void Update::update_time()
+{
+  atime += (ntimestep-atimestep) * dt;
+  atimestep = ntimestep;
+}
+
 /* ----------------------------------------------------------------------
    memory usage of update and integrate/minimize
 ------------------------------------------------------------------------- */
diff --git a/src/update.h b/src/update.h
index 1fccec766d..53bf041dea 100644
--- a/src/update.h
+++ b/src/update.h
@@ -25,6 +25,8 @@ class Update : protected Pointers {
   bigint ntimestep;               // current step (dynamics or min iterations)
   int nsteps;                     // # of steps to run (dynamics or min iter)
   int whichflag;                  // 0 for unset, 1 for dynamics, 2 for min
+  double atime;                   // simulation time at atime_step
+  bigint atimestep;               // last timestep atime was updated
   bigint firststep,laststep;      // 1st & last step of this run
   bigint beginstep,endstep;       // 1st and last step of multiple runs
   int first_update;               // 0 before initial update, 1 after
@@ -52,6 +54,7 @@ class Update : protected Pointers {
   void create_minimize(int, char **);
   void reset_timestep(int, char **);
   void reset_timestep(bigint);
+  void update_time();
   bigint memory_usage();
 
  private:
diff --git a/src/verlet.cpp b/src/verlet.cpp
index db47a675c6..f6c6a3ccf9 100644
--- a/src/verlet.cpp
+++ b/src/verlet.cpp
@@ -319,6 +319,7 @@ void Verlet::cleanup()
 {
   modify->post_run();
   domain->box_too_small_check();
+  update->update_time();
 }
 
 /* ----------------------------------------------------------------------