diff --git a/README.md b/README.md
index 8495d007..de83d890 100644
--- a/README.md
+++ b/README.md
@@ -5,6 +5,9 @@ This README is being written.<br>
 
 ## Announcements
 
+* **13 May 2018**
+	* Added new functions to work with uiDateTimePickers: `uiDateTimePickerTime()`, `uiDateTimePickerSetTime()`, and `uiDateTimePickerOnChanged()`. These operate on standard `<time.h>` `struct tm`s. Thanks @cody271!
+
 * **2 May 2018**
 	* On Windows, you no longer need to carry around a `libui.res` file with static builds. You do need to link in the appropriate manifest file, such as the one in the `windows/` folder (I still need to figure out exactly what is needed apart from the Common Controls v6 dependency, or at least to create a complete-ish template), or at least include it alongside your executables. This also means you should no longer see random cmake errors when building the static libraries.
 
diff --git a/darwin/datetimepicker.m b/darwin/datetimepicker.m
index 54c6ba38..d4424678 100644
--- a/darwin/datetimepicker.m
+++ b/darwin/datetimepicker.m
@@ -8,8 +8,10 @@ struct uiDateTimePicker {
 	void *onChangedData;
 };
 
-@interface uiprivDatePickerDelegateClass : NSObject <NSDatePickerCellDelegate> {
-	struct uiprivMap *pickers;
+// TODO see if target-action works here or not; I forgot what cody271@ originally said
+// the primary advantage of the delegate is the ability to reject changes, but libui doesn't support that yet — we should consider that API option as well
+@interface uiprivDatePickerDelegateClass : NSObject<NSDatePickerCellDelegate> {
+	uiprivMap *pickers;
 }
 - (void)datePickerCell:(NSDatePickerCell *)aDatePickerCell validateProposedDateValue:(NSDate **)proposedDateValue timeInterval:(NSTimeInterval *)proposedTimeInterval;
 - (void)doTimer:(NSTimer *)timer;
@@ -33,13 +35,11 @@ struct uiDateTimePicker {
 	[super dealloc];
 }
 
-- (void)datePickerCell:(NSDatePickerCell *)aDatePickerCell
-	validateProposedDateValue:(NSDate **)proposedDateValue
-	timeInterval:(NSTimeInterval *)proposedTimeInterval
+- (void)datePickerCell:(NSDatePickerCell *)cell validateProposedDateValue:(NSDate **)proposedDateValue timeInterval:(NSTimeInterval *)proposedTimeInterval
 {
 	uiDateTimePicker *d;
 
-	d = (uiDateTimePicker *) uiprivMapGet(self->pickers, aDatePickerCell);
+	d = (uiDateTimePicker *) uiprivMapGet(self->pickers, cell);
 	[NSTimer scheduledTimerWithTimeInterval:0
 		target:self
 		selector:@selector(doTimer:)
@@ -49,9 +49,11 @@ struct uiDateTimePicker {
 
 - (void)doTimer:(NSTimer *)timer
 {
+	NSValue *v;
 	uiDateTimePicker *d;
 
-	d = (uiDateTimePicker *) [((NSValue *)[timer userInfo]) pointerValue];
+	v = (NSValue *) [timer userInfo];
+	d = (uiDateTimePicker *) [v pointerValue];
 	(*(d->onChanged))(d, d->onChangedData);
 }
 
@@ -78,6 +80,7 @@ static void defaultOnChanged(uiDateTimePicker *d, void *data)
 	// do nothing
 }
 
+// TODO consider using NSDateComponents iff we ever need the extra accuracy of not using NSTimeInterval
 void uiDateTimePickerTime(uiDateTimePicker *d, struct tm *time)
 {
 	time_t t;
@@ -90,7 +93,7 @@ void uiDateTimePickerTime(uiDateTimePicker *d, struct tm *time)
 	// Copy time to minimize a race condition
 	// time.h functions use global non-thread-safe data
 	tmbuf = *localtime(&t);
-	memcpy(time, &tmbuf, sizeof(struct tm));
+	memcpy(time, &tmbuf, sizeof (struct tm));
 }
 
 void uiDateTimePickerSetTime(uiDateTimePicker *d, const struct tm *time)
@@ -99,7 +102,7 @@ void uiDateTimePickerSetTime(uiDateTimePicker *d, const struct tm *time)
 	struct tm tmbuf;
 
 	// Copy time because mktime() modifies its argument
-	memcpy(&tmbuf, time, sizeof(struct tm));
+	memcpy(&tmbuf, time, sizeof (struct tm));
 	t = mktime(&tmbuf);
 
 	[d->dp setDateValue:[NSDate dateWithTimeIntervalSince1970:t]];
diff --git a/examples/CMakeLists.txt b/examples/CMakeLists.txt
index 4c049b9a..b68f9706 100644
--- a/examples/CMakeLists.txt
+++ b/examples/CMakeLists.txt
@@ -23,11 +23,6 @@ _add_example(histogram
 	${_EXAMPLE_RESOURCES_RC}
 )
 
-_add_example(datetime
-	datetime/main.c
-	${_EXAMPLE_RESOURCES_RC}
-)
-
 _add_example(cpp-multithread
 	cpp-multithread/main.cpp
 	${_EXAMPLE_RESOURCES_RC}
@@ -52,11 +47,16 @@ _add_example(timer
         ${_EXAMPLE_RESOURCES_RC}
 )
 
+_add_example(datetime
+	datetime/main.c
+	${_EXAMPLE_RESOURCES_RC}
+)
+
 add_custom_target(examples
 	DEPENDS
 		controlgallery
 		histogram
 		cpp-multithread
 		drawtext
-		datetime
-		timer)
+		timer
+		datetime)
diff --git a/examples/datetime/main.c b/examples/datetime/main.c
index e71b54a6..faf2c2f4 100644
--- a/examples/datetime/main.c
+++ b/examples/datetime/main.c
@@ -17,7 +17,6 @@ const char *timeFormat(uiDateTimePicker *d)
 		fmt = "%X";
 	else
 		fmt = "";
-
 	return fmt;
 }
 
@@ -59,14 +58,19 @@ int onClosing(uiWindow *w, void *data)
 int main(void)
 {
 	uiInitOptions o;
+	const char *err;
 	uiWindow *w;
 	uiGrid *g;
 	uiLabel *l;
 	uiButton *b;
 
 	memset(&o, 0, sizeof (uiInitOptions));
-	if (uiInit(&o) != NULL)
-		abort();
+	err = uiInit(&o);
+	if (err != NULL) {
+		fprintf(stderr, "error initializing ui: %s\n", err);
+		uiFreeInitError(err);
+		return 1;
+	}
 
 	w = uiNewWindow("Date / Time", 320, 240, 0);
 	uiWindowSetMargined(w, 1);
diff --git a/unix/datetimepicker.c b/unix/datetimepicker.c
index 5f052dca..0f57b721 100644
--- a/unix/datetimepicker.c
+++ b/unix/datetimepicker.c
@@ -116,6 +116,7 @@ static void dateTimeChanged(uiprivDateTimePickerWidget *d)
 {
 	g_signal_emit(d, changedSignal, 0);
 	setLabel(d);
+	// TODO fire event here instead?
 }
 
 // we don't want ::toggled to be sent again
@@ -579,7 +580,7 @@ void uiDateTimePickerTime(uiDateTimePicker *d, struct tm *time)
 	// Copy time to minimize a race condition
 	// time.h functions use global non-thread-safe data
 	tmbuf = *localtime(&t);
-	memcpy(time, &tmbuf, sizeof(struct tm));
+	memcpy(time, &tmbuf, sizeof (struct tm));
 }
 
 void uiDateTimePickerSetTime(uiDateTimePicker *d, const struct tm *time)
@@ -588,7 +589,7 @@ void uiDateTimePickerSetTime(uiDateTimePicker *d, const struct tm *time)
 	struct tm tmbuf;
 
 	// Copy time because mktime() modifies its argument
-	memcpy(&tmbuf, time, sizeof(struct tm));
+	memcpy(&tmbuf, time, sizeof (struct tm));
 	t = mktime(&tmbuf);
 
 	uiprivDateTimePickerWidget_setTime(d->d, g_date_time_new_from_unix_local(t));
diff --git a/windows/datetimepicker.cpp b/windows/datetimepicker.cpp
index 26841dae..32546cf8 100644
--- a/windows/datetimepicker.cpp
+++ b/windows/datetimepicker.cpp
@@ -4,7 +4,7 @@
 struct uiDateTimePicker {
 	uiWindowsControl c;
 	HWND hwnd;
-	void(*onChanged)(uiDateTimePicker *, void *);
+	void (*onChanged)(uiDateTimePicker *, void *);
 	void *onChangedData;
 };
 
@@ -191,10 +191,9 @@ void uiDateTimePickerSetTime(uiDateTimePicker *d, const struct tm *time)
 	toSystemTime(time, &systime);
 	if (SendMessageW(d->hwnd, DTM_SETSYSTEMTIME, GDT_VALID, (LPARAM) (&systime)) == 0)
 		logLastError(L"error setting date and time");
-	(*(d->onChanged))(d, d->onChangedData);
 }
 
-void uiDateTimePickerOnChanged(uiDateTimePicker *d, void(*f)(uiDateTimePicker *, void *), void *data)
+void uiDateTimePickerOnChanged(uiDateTimePicker *d, void (*f)(uiDateTimePicker *, void *), void *data)
 {
 	d->onChanged = f;
 	d->onChangedData = data;