diff --git a/aegisub/src/command/time.cpp b/aegisub/src/command/time.cpp
index 10afa8c1a..76aef03c1 100644
--- a/aegisub/src/command/time.cpp
+++ b/aegisub/src/command/time.cpp
@@ -69,7 +69,7 @@ namespace {
 		CMD_TYPE(COMMAND_VALIDATE)
 		bool Validate(const agi::Context *c) {
 			SubtitleSelection sel = c->selectionController->GetSelectedSet();
-			if (sel.size() < 2) return false;
+			if (sel.size() < 2) return !sel.empty();
 
 			size_t found = 0;
 			for (auto diag : c->ass->Line | agi::of_type<AssDialogue>()) {
@@ -87,6 +87,34 @@ namespace {
 /// @defgroup cmd-time Time manipulation commands.
 /// @{
 
+static void adjoin_lines(agi::Context *c, bool set_start) {
+	auto sel = c->selectionController->GetSelectedSet();
+	AssDialogue *prev = nullptr;
+	size_t seen = 0;
+	bool prev_sel = false;
+	for (auto diag : c->ass->Line | agi::of_type<AssDialogue>()) {
+		bool cur_sel = !!sel.count(diag);
+		if (prev) {
+			// One row selections act as if the previous or next line was selected
+			if (set_start && cur_sel && (sel.size() == 1 || prev_sel))
+				diag->Start = prev->End;
+			else if (!set_start && prev_sel && (cur_sel || sel.size() == 1))
+				prev->End = diag->Start;
+		}
+
+		if (seen == sel.size())
+			break;
+
+		if (cur_sel)
+			++seen;
+
+		prev = diag;
+		prev_sel = cur_sel;
+	}
+
+	c->ass->Commit(_("adjoin"), AssFile::COMMIT_DIAG_TIME);
+}
+
 /// Changes times of subs so end times begin on next's start time.
 struct time_continuous_end : public validate_adjoinable {
 	CMD_NAME("time/continuous/end")
@@ -95,12 +123,10 @@ struct time_continuous_end : public validate_adjoinable {
 	STR_HELP("Changes times of subs so end times begin on next's start time")
 
 	void operator()(agi::Context *c) {
-		wxArrayInt sels = c->subsGrid->GetSelection();
-		c->subsGrid->AdjoinLines(sels.front(), sels.back(), false);
+		adjoin_lines(c, false);
 	}
 };
 
-
 /// Changes times of subs so start times begin on previous's end time.
 struct time_continuous_start : public validate_adjoinable {
 	CMD_NAME("time/continuous/start")
@@ -109,10 +135,8 @@ struct time_continuous_start : public validate_adjoinable {
 	STR_HELP("Changes times of subs so start times begin on previous's end time")
 
 	void operator()(agi::Context *c) {
-		wxArrayInt sels = c->subsGrid->GetSelection();
-		c->subsGrid->AdjoinLines(sels.front(), sels.back(), true);
+		adjoin_lines(c, true);
 	}
-
 };
 
 
diff --git a/aegisub/src/subs_grid.cpp b/aegisub/src/subs_grid.cpp
index f4fef7f33..a79bcb2b3 100644
--- a/aegisub/src/subs_grid.cpp
+++ b/aegisub/src/subs_grid.cpp
@@ -151,39 +151,3 @@ void SubtitlesGrid::RecombineLines() {
 
 	context->ass->Commit(_("combining"), AssFile::COMMIT_DIAG_ADDREM | AssFile::COMMIT_DIAG_FULL);
 }
-
-void SubtitlesGrid::AdjoinLines(int n1,int n2,bool setStart) {
-	if (n1 == n2) {
-		if (setStart) {
-			--n1;
-		}
-		else {
-			++n2;
-		}
-	}
-	// Set start
-	if (setStart) {
-		AssDialogue *prev = GetDialogue(n1);
-		AssDialogue *cur;
-		for (int i=n1+1;i<=n2;i++) {
-			cur = GetDialogue(i);
-			if (!cur) return;
-			cur->Start = prev->End;
-			prev = cur;
-		}
-	}
-
-	// Set end
-	else {
-		AssDialogue *next;
-		AssDialogue *cur = GetDialogue(n1);
-		for (int i=n1;i<n2;i++) {
-			next = GetDialogue(i+1);
-			if (!next) return;
-			cur->End = next->Start;
-			cur = next;
-		}
-	}
-
-	context->ass->Commit(_("adjoin"), AssFile::COMMIT_DIAG_TIME);
-}
diff --git a/aegisub/src/subs_grid.h b/aegisub/src/subs_grid.h
index 93f7b3449..33632b94e 100644
--- a/aegisub/src/subs_grid.h
+++ b/aegisub/src/subs_grid.h
@@ -38,11 +38,5 @@ class SubtitlesGrid: public BaseGrid {
 public:
 	SubtitlesGrid(wxWindow *parent, agi::Context *context);
 
-	/// @brief Adjoins selected lines, setting each line's start time to the previous line's end time
-	/// @param n1       First line to adjoin
-	/// @param n2       Last line to adjoin
-	/// @param setStart Set the start times (rather than end times)
-	void AdjoinLines(int first,int last,bool setStart);
-
 	void RecombineLines();
 };