diff --git a/boards/PICO_R1_3.py b/boards/PICO_R1_3.py
index 3cff7a380a..e396c5265c 100644
--- a/boards/PICO_R1_3.py
+++ b/boards/PICO_R1_3.py
@@ -46,6 +46,7 @@
      'DEFINES+=-DUSE_USB_OTG_FS=1  -DPICO -DPICO_1V3',
      'DEFINES+=-DPIN_NAMES_DIRECT=1', # Package skips out some pins, so we can't assume each port starts from 0
      'DEFINES += -DESPR_USE_STEPPER_TIMER=1', # Build in the code for stepping using the timer
+     'DEFINES += -DESPR_LIMIT_DATE_RANGE', # not enough code memory left for the full range of Date()
      'STLIB=STM32F401xE',
      'PRECOMPILED_OBJS+=$(ROOT)/targetlibs/stm32f4/lib/startup_stm32f401xx.o'
    ]
diff --git a/libs/filesystem/jswrap_fs.c b/libs/filesystem/jswrap_fs.c
index 89a3d6b849..5403091b8c 100755
--- a/libs/filesystem/jswrap_fs.c
+++ b/libs/filesystem/jswrap_fs.c
@@ -358,7 +358,7 @@ JsVar *jswrap_fs_stat(JsVar *path) {
       date.month = (int)(((info.fdate>>5)&15)-1);  // TomWS: Month is 0 based.
       date.day = (int)((info.fdate)&31);
       TimeInDay td;
-      td.daysSinceEpoch = fromCalenderDate(&date);
+      td.daysSinceEpoch = fromCalendarDate(&date);
       td.hour = (int)((info.ftime>>11)&31);
       td.min = (int)((info.ftime>>5)&63);
       td.sec = (int)((info.ftime)&63);
diff --git a/libs/misc/nmea.c b/libs/misc/nmea.c
index df1ab2e4c4..f0ea3becba 100644
--- a/libs/misc/nmea.c
+++ b/libs/misc/nmea.c
@@ -184,7 +184,7 @@ JsVar *nmea_to_jsVar(NMEAFixInfo *gpsFix) {
       date.month = gpsFix->month-1; // 1 based to 0 based
       date.year = 2000+gpsFix->year;
       TimeInDay td;
-      td.daysSinceEpoch = fromCalenderDate(&date);
+      td.daysSinceEpoch = fromCalendarDate(&date);
       td.hour = gpsFix->hour;
       td.min = gpsFix->min;
       td.sec = gpsFix->sec;
diff --git a/src/jswrap_date.c b/src/jswrap_date.c
index 7697eed866..b087bc6ec7 100644
--- a/src/jswrap_date.c
+++ b/src/jswrap_date.c
@@ -23,17 +23,38 @@ const int BASE_DOW = 4;
 const char *MONTHNAMES = "Jan\0Feb\0Mar\0Apr\0May\0Jun\0Jul\0Aug\0Sep\0Oct\0Nov\0Dec";
 const char *DAYNAMES = "Sun\0Mon\0Tue\0Wed\0Thu\0Fri\0Sat";
 
+#ifdef ESPR_LIMIT_DATE_RANGE
+// This rounds towards zero - which is not what the algorithm needs. Hence the range for Date() is further limited when ESPR_LIMIT_DATE_RANGE is set
+#define INTEGER_DIVIDE_FLOOR(a,b) ((a)/(b))
+#else
+// This rounds down, which is what the algorithm needs
+int integerDivideFloor(int a, int b) {
+  return (a < 0 ? a-b+1 : a)/b;
+}
+#define INTEGER_DIVIDE_FLOOR(a,b) integerDivideFloor((a),(b))
+#endif
+
+
 // Convert y,m,d into a number of days since 1970, where 0<=m<=11
 // https://github.com/deirdreobyrne/CalendarAndDST
 int getDayNumberFromDate(int y, int m, int d) {
   int ans;
-
-  if (m < 2) {
+  
+#ifdef ESPR_LIMIT_DATE_RANGE
+  if (y < 1500 || y >= 1250000) { // Should actually work down to 1101, but since the Gregorian calendar started in 1582 . . .
+#else
+  if (y < -1250000 || y >= 1250000) {
+#endif
+    jsExceptionHere(JSET_ERROR, "Date out of bounds");
+    return 0; // Need to head off any overflow error
+  }
+  while (m < 2) {
     y--;
     m+=12;
   }
-  ans = (y/100);
-  return 365*y + (y>>2) - ans + (ans>>2) + 30*m + ((3*m+6)/5) + d - 719531;
+  // #2456 was created by integer division rounding towards zero, rather than the FLOOR-behaviour required by the algorithm.
+  ans = INTEGER_DIVIDE_FLOOR(y,100);
+  return 365*y + INTEGER_DIVIDE_FLOOR(y,4) - ans + INTEGER_DIVIDE_FLOOR(ans,4) + 30*m + ((3*m+6)/5) + d - 719531;
 }
 
 // Convert a number of days since 1970 into y,m,d. 0<=m<=11
@@ -41,11 +62,13 @@ int getDayNumberFromDate(int y, int m, int d) {
 void getDateFromDayNumber(int day, int *y, int *m, int *date) {
   int a = day + 135081;
   int b,c,d;
-  a = (a-(a/146097)+146095)/36524;
-  a = day + a - (a>>2);
-  b = ((a<<2)+2877911)/1461;
-  c = a + 719600 - 365*b - (b>>2);
-  d = (5*c-1)/153;
+
+  // Bug #2456 fixed here too
+  a = INTEGER_DIVIDE_FLOOR(a - INTEGER_DIVIDE_FLOOR(a,146097) + 146095,36524);
+  a = day + a - INTEGER_DIVIDE_FLOOR(a,4);
+  b = INTEGER_DIVIDE_FLOOR((a<<2)+2877911,1461);
+  c = a + 719600 - 365*b - INTEGER_DIVIDE_FLOOR(b,4);
+  d = (5*c-1)/153; // Floor behaviour not needed, as c is always positive
   if (date) *date=c-30*d-((3*d)/5);
   if (m) {
     if (d<14)
@@ -178,7 +201,7 @@ CalendarDate getCalendarDate(int d) {
   return date;
 };
 
-int fromCalenderDate(CalendarDate *date) {
+int fromCalendarDate(CalendarDate *date) {
   while (date->month < 0) {
     date->year--;
     date->month += 12;
@@ -298,7 +321,7 @@ JsVar *jswrap_date_constructor(JsVar *args) {
     date.month = (int)(jsvGetIntegerAndUnLock(jsvGetArrayItem(args, 1)));
     date.day = (int)(jsvGetIntegerAndUnLock(jsvGetArrayItem(args, 2)));
     TimeInDay td;
-    td.daysSinceEpoch = fromCalenderDate(&date);
+    td.daysSinceEpoch = fromCalendarDate(&date);
     td.hour = (int)(jsvGetIntegerAndUnLock(jsvGetArrayItem(args, 3)));
     td.min = (int)(jsvGetIntegerAndUnLock(jsvGetArrayItem(args, 4)));
     td.sec = (int)(jsvGetIntegerAndUnLock(jsvGetArrayItem(args, 5)));
@@ -376,6 +399,14 @@ JsVarFloat jswrap_date_getTime(JsVar *date) {
 Set the time/date of this Date class
  */
 JsVarFloat jswrap_date_setTime(JsVar *date, JsVarFloat timeValue) {
+#ifdef ESPR_LIMIT_DATE_RANGE
+  if (timeValue < -1.48317696e13 || timeValue >= 3.93840543168E+016) { // This should actually work down to 1101AD . . .
+#else
+  if (timeValue < -3.95083256832E+016 || timeValue >= 3.93840543168E+016) {
+#endif
+    jsExceptionHere(JSET_ERROR, "Date out of bounds");
+    return 0.0;
+  }
   if (date)
     jsvObjectSetChildAndUnLock(date, "ms", jsvNewFromFloat(timeValue));
   return timeValue;
@@ -607,7 +638,7 @@ JsVarFloat jswrap_date_setDate(JsVar *parent, int dayValue) {
   TimeInDay td = getTimeFromDateVar(parent, false/*system timezone*/);
   CalendarDate d = getCalendarDate(td.daysSinceEpoch);
   d.day = dayValue;
-  td.daysSinceEpoch = fromCalenderDate(&d);
+  td.daysSinceEpoch = fromCalendarDate(&d);
   setCorrectTimeZone(&td);
   return jswrap_date_setTime(parent, fromTimeInDay(&td));
 }
@@ -620,11 +651,11 @@ JsVarFloat jswrap_date_setDate(JsVar *parent, int dayValue) {
   "name" : "setMonth",
   "generate" : "jswrap_date_setMonth",
   "params" : [
-    ["yearValue","int","The month, between 0 and 11"],
+    ["monthValue","int","The month, between 0 and 11"],
     ["dayValue","JsVar","[optional] the day, between 0 and 31"]
   ],
   "return" : ["float","The number of milliseconds since 1970"],
-  "typescript" : "setMonth(yearValue: number, dayValue?: number): number;"
+  "typescript" : "setMonth(monthValue: number, dayValue?: number): number;"
 }
 Month of the year 0..11
  */
@@ -634,7 +665,7 @@ JsVarFloat jswrap_date_setMonth(JsVar *parent, int monthValue, JsVar *dayValue)
   d.month = monthValue;
   if (jsvIsNumeric(dayValue))
     d.day = jsvGetInteger(dayValue);
-  td.daysSinceEpoch = fromCalenderDate(&d);
+  td.daysSinceEpoch = fromCalendarDate(&d);
   setCorrectTimeZone(&td);
   return jswrap_date_setTime(parent, fromTimeInDay(&td));
 }
@@ -662,7 +693,7 @@ JsVarFloat jswrap_date_setFullYear(JsVar *parent, int yearValue, JsVar *monthVal
     d.month = jsvGetInteger(monthValue);
   if (jsvIsNumeric(dayValue))
     d.day = jsvGetInteger(dayValue);
-  td.daysSinceEpoch = fromCalenderDate(&d);
+  td.daysSinceEpoch = fromCalendarDate(&d);
   setCorrectTimeZone(&td);
   return jswrap_date_setTime(parent, fromTimeInDay(&td));
 }
@@ -874,7 +905,7 @@ JsVarFloat jswrap_date_parse(JsVar *str) {
           jslGetNextToken();
           if (lex.tk == LEX_INT) {
             date.year = _parse_int();
-            time.daysSinceEpoch = fromCalenderDate(&date);
+            time.daysSinceEpoch = fromCalendarDate(&date);
             jslGetNextToken();
             if (lex.tk == LEX_INT) {
               _parse_time(&time, 0);
@@ -897,7 +928,7 @@ JsVarFloat jswrap_date_parse(JsVar *str) {
             jslGetNextToken();
             if (lex.tk == LEX_INT) {
               date.year = _parse_int();
-              time.daysSinceEpoch = fromCalenderDate(&date);
+              time.daysSinceEpoch = fromCalendarDate(&date);
               jslGetNextToken();
               if (lex.tk == LEX_INT) {
                 _parse_time(&time, 0);
@@ -924,7 +955,7 @@ JsVarFloat jswrap_date_parse(JsVar *str) {
           jslGetNextToken();
           if (lex.tk == LEX_INT) {
             date.day = _parse_int();
-            time.daysSinceEpoch = fromCalenderDate(&date);
+            time.daysSinceEpoch = fromCalendarDate(&date);
             jslGetNextToken();
             if (lex.tk == LEX_ID && jslGetTokenValueAsString()[0]=='T') {
               _parse_time(&time, 1);
diff --git a/src/jswrap_date.h b/src/jswrap_date.h
index 95bbb4eafc..0f6eee732b 100644
--- a/src/jswrap_date.h
+++ b/src/jswrap_date.h
@@ -41,7 +41,7 @@ void setCorrectTimeZone(TimeInDay *td);
 TimeInDay getTimeFromMilliSeconds(JsVarFloat ms_in, bool forceGMT);
 JsVarFloat fromTimeInDay(TimeInDay *td);
 CalendarDate getCalendarDate(int d);
-int fromCalenderDate(CalendarDate *date);
+int fromCalendarDate(CalendarDate *date);
 
 JsVarFloat jswrap_date_now();
 JsVar *jswrap_date_from_milliseconds(JsVarFloat time);
diff --git a/targets/nrf5x/bluetooth_ancs.c b/targets/nrf5x/bluetooth_ancs.c
index 348c2acfb2..0da1c950c6 100644
--- a/targets/nrf5x/bluetooth_ancs.c
+++ b/targets/nrf5x/bluetooth_ancs.c
@@ -289,7 +289,7 @@ void ble_cts_handle_time(BLEPending blep, char *buffer, size_t bufferLen) {
   date.month = time.month-1; // JS months are 0-11, but CTS uses 1-12
   date.day = time.day;
   TimeInDay td;
-  td.daysSinceEpoch = fromCalenderDate(&date);
+  td.daysSinceEpoch = fromCalendarDate(&date);
   td.hour = time.hours;
   td.min = time.minutes;
   td.sec = time.seconds;
diff --git a/targets/stm32/jshardware.c b/targets/stm32/jshardware.c
index 853a887963..9e48f9878b 100644
--- a/targets/stm32/jshardware.c
+++ b/targets/stm32/jshardware.c
@@ -1536,7 +1536,7 @@ JsSysTime jshGetRTCSystemTime() {
   cdate.month = date.RTC_Month-1; // 1..12 -> 0..11
   cdate.year = 2000+date.RTC_Year; // 0..99 -> 2000..2099
   cdate.dow = date.RTC_WeekDay%7; // 1(monday)..7 -> 0(sunday)..6
-  ctime.daysSinceEpoch = fromCalenderDate(&cdate);
+  ctime.daysSinceEpoch = fromCalendarDate(&cdate);
   ctime.zone = 0;
   ctime.ms = 0;
   ctime.sec = time.RTC_Seconds;
diff --git a/tests/test_date.js b/tests/test_date.js
index 71ddd81300..905a963277 100644
--- a/tests/test_date.js
+++ b/tests/test_date.js
@@ -1,5 +1,12 @@
 pass=0;
 
+try { new Date(4.1e16); pass--; } catch(e) { };
+try { new Date(-4.1e16); pass--; } catch(e) { };
+try { new Date(2000000,0); pass--; } catch(e) { };
+try { new Date(-2000000,0); pass--; } catch(e) { };
+// This next Date() constructor use to give a segfault. However it is now out of range for the PICO_R1_3
+try { a = new Date(-12,8).toString(); if (!(a== "Wed Aug 31 -12 00:00:00 GMT+0000")) pass--; } catch (e) { };
+
 var gmt = [
 [ Date.parse("2011-10-20") , 1319068800000.0 ],
 [ Date.parse("2011-10-20T14:48:12.345") , 1319122092345.0 ],
@@ -11,7 +18,10 @@ var gmt = [
 [ new Date(807926400000.0).toString() , "Wed Aug 9 1995 00:00:00 GMT+0000" ],
 [ new Date("Fri, 20 Jun 2014 15:27:22 GMT").toString(), "Fri Jun 20 2014 15:27:22 GMT+0000"],
 [ new Date("Fri, 20 Jun 2014 15:27:22 GMT").toISOString(), "2014-06-20T15:27:22.000Z"],
-[ new Date("Fri, 20 Jun 2014 17:27:22 GMT+0200").toISOString(), "2014-06-20T15:27:22.000Z"]
+[ new Date("Fri, 20 Jun 2014 17:27:22 GMT+0200").toISOString(), "2014-06-20T15:27:22.000Z"],
+[ new Date("5000-1-1").toString(), "Wed Jan 1 5000 00:00:00 GMT+0000"],
+[ new Date(1500,0,1).toString(), "Mon Jan 1 1500 00:00:00 GMT+0000"],
+[ new Date(1500,0,1).getTime(), -14831769600000]
 ];
 
 gmt.forEach(function(n) { if (n[0]==n[1]) pass++; });