Set the Gregorian changeover date to the beginning of time in Intl

src/i18n.cc

Index: src/i18n.cc
diff --git a/src/i18n.cc b/src/i18n.cc
index 7899f2937d5430760cae3ef60cd81e24d94452a8..4f5431fa95fd9904dc4f858cdc9e66f62a74638c 100644
--- a/src/i18n.cc
+++ b/src/i18n.cc
@@ -16,6 +16,7 @@
 #include "unicode/decimfmt.h"
 #include "unicode/dtfmtsym.h"
 #include "unicode/dtptngen.h"
+#include "unicode/gregocal.h"
 #include "unicode/locid.h"
 #include "unicode/numfmt.h"
 #include "unicode/numsys.h"
@@ -96,6 +97,16 @@ icu::SimpleDateFormat* CreateICUDateFormat(
   icu::Calendar* calendar =
       icu::Calendar::createInstance(tz, icu_locale, status);
 
+  if (calendar->getDynamicClassID() ==
+      icu::GregorianCalendar::getStaticClassID()) {
+    icu::GregorianCalendar* gc = (icu::GregorianCalendar*)calendar;
+    UErrorCode status = U_ZERO_ERROR;
+    // The beginning of ECMAScript time, namely -(2**53)
+    const double start_of_time = -9007199254740992;
+    gc->setGregorianChange(start_of_time, status);
+    DCHECK(U_SUCCESS(status));
+  }
+
   // Make formatter from skeleton. Calendar and numbering system are added
   // to the locale as Unicode extension (if they were specified at all).
   icu::SimpleDateFormat* date_format = NULL;