These functions are now UCS2 compatible:

CURDATE()
FROM_DAYS()
CURTIME()
NOW()
SEC_TO_TIME()
FROM_UNIXTIME()
DATE_ADD_INTERVAL()  

sql/item_timefunc.cc

@@ -402,16 +402,16 @@ String *Item_date::val_str(String *str)
     return (String*) 0;
   if (!value)					// zero daynr
   {
-    str->copy("0000-00-00",10,my_charset_latin1);
+    str->copy("0000-00-00",10,my_charset_latin1,thd_charset());
     return str;
   }
-  if (str->alloc(11))
-    return &empty_string;			/* purecov: inspected */
-  sprintf((char*) str->ptr(),"%04d-%02d-%02d",
+  
+  char tmpbuff[11];
+  sprintf(tmpbuff,"%04d-%02d-%02d",
 	  (int) (value/10000L) % 10000,
 	  (int) (value/100)%100,
 	  (int) (value%100));
-  str->length(10);
+  str->copy(tmpbuff,10,my_charset_latin1,thd_charset());
   return str;
 }
 
@@ -448,7 +448,10 @@ void Item_func_curdate::fix_length_and_dec()
 {
   struct tm tm_tmp,*start;
   time_t query_start=current_thd->query_start();
-  decimals=0; max_length=10;
+  
+  set_charset(thd_charset());
+  decimals=0; 
+  max_length=10*thd_charset()->mbmaxlen;
   localtime_r(&query_start,&tm_tmp);
   start=&tm_tmp;
   value=(longlong) ((ulong) ((uint) start->tm_year+1900)*10000L+
@@ -473,27 +476,48 @@ bool Item_func_curdate::get_date(TIME *res,
   return 0;
 }
 
+String *Item_func_curtime::val_str(String *str)
+{ 
+  str_value.set(buff,buff_length,thd_charset());
+  return &str_value;
+}
+
 void Item_func_curtime::fix_length_and_dec()
 {
   struct tm tm_tmp,*start;
   time_t query_start=current_thd->query_start();
-  decimals=0; max_length=8;
+  CHARSET_INFO *cs=thd_charset();
+
+  decimals=0; 
+  max_length=8*cs->mbmaxlen;
   localtime_r(&query_start,&tm_tmp);
   start=&tm_tmp;
+  set_charset(cs);
   value=(longlong) ((ulong) ((uint) start->tm_hour)*10000L+
 		    (ulong) (((uint) start->tm_min)*100L+
 			     (uint) start->tm_sec));
-  buff_length= my_sprintf(buff, (buff,"%02d:%02d:%02d",
+
+  buff_length=cs->snprintf(cs,buff,sizeof(buff),"%02d:%02d:%02d",
 				 (int) start->tm_hour,
 				 (int) start->tm_min,
-				 (int) start->tm_sec));
+				 (int) start->tm_sec);
+}
+
+String *Item_func_now::val_str(String *str)
+{
+  str_value.set(buff,buff_length,thd_charset());
+  return &str_value;
 }
 
 void Item_func_now::fix_length_and_dec()
 {
   struct tm tm_tmp,*start;
   time_t query_start=current_thd->query_start();
-  decimals=0; max_length=19;
+  CHARSET_INFO *cs=thd_charset();
+  
+  decimals=0;
+  max_length=19*cs->mbmaxlen;
+  set_charset(cs);
   localtime_r(&query_start,&tm_tmp);
   start=&tm_tmp;
   value=((longlong) ((ulong) ((uint) start->tm_year+1900)*10000L+
@@ -502,13 +526,14 @@ void Item_func_now::fix_length_and_dec()
 	 (longlong) ((ulong) ((uint) start->tm_hour)*10000L+
 		     (ulong) (((uint) start->tm_min)*100L+
 			    (uint) start->tm_sec)));
-  buff_length= (uint) my_sprintf(buff, (buff,"%04d-%02d-%02d %02d:%02d:%02d",
+  
+  buff_length= (uint) cs->snprintf(cs,buff, sizeof(buff),"%04d-%02d-%02d %02d:%02d:%02d",
 					((int) (start->tm_year+1900)) % 10000,
 					(int) start->tm_mon+1,
 					(int) start->tm_mday,
 					(int) start->tm_hour,
 					(int) start->tm_min,
-					(int) start->tm_sec));
+					(int) start->tm_sec);
   /* For getdate */
   ltime.year=	start->tm_year+1900;
   ltime.month=	start->tm_mon+1;
@@ -539,7 +564,7 @@ int  Item_func_now::save_in_field(Field *to)
 
 String *Item_func_sec_to_time::val_str(String *str)
 {
-  char buff[23];
+  char buff[23*2];
   const char *sign="";
   longlong seconds=(longlong) args[0]->val_int();
   ulong length;
@@ -553,7 +578,7 @@ String *Item_func_sec_to_time::val_str(String *str)
   uint sec= (uint) ((ulonglong) seconds % 3600);
   length= my_sprintf(buff,(buff,"%s%02lu:%02u:%02u",sign,(long) (seconds/3600),
 			   sec/60, sec % 60));
-  str->copy(buff, length, my_charset_latin1);
+  str->copy(buff, length, my_charset_latin1, thd_charset());
   return str;
 }
 
@@ -897,20 +922,26 @@ String *Item_func_from_unixtime::val_str(String *str)
 {
   struct tm tm_tmp,*start;
   time_t tmp=(time_t) args[0]->val_int();
+  uint32 l;
+  CHARSET_INFO *cs=thd_charset();
+  
   if ((null_value=args[0]->null_value))
     return 0;
   localtime_r(&tmp,&tm_tmp);
   start=&tm_tmp;
-  if (str->alloc(20))
+  
+  l=20*cs->mbmaxlen+32;
+  if (str->alloc(l))
     return str;					/* purecov: inspected */
-  sprintf((char*) str->ptr(),"%04d-%02d-%02d %02d:%02d:%02d",
+  l=cs->snprintf(cs,(char*) str->ptr(),l,"%04d-%02d-%02d %02d:%02d:%02d",
 	  (int) start->tm_year+1900,
 	  (int) start->tm_mon+1,
 	  (int) start->tm_mday,
 	  (int) start->tm_hour,
 	  (int) start->tm_min,
 	  (int) start->tm_sec);
-  str->length(19);
+  str->length(l);
+  str->set_charset(cs);
   return str;
 }
 
@@ -1041,26 +1072,31 @@ bool Item_date_add_interval::get_date(TIME *ltime, bool fuzzy_date)
 String *Item_date_add_interval::val_str(String *str)
 {
   TIME ltime;
+  CHARSET_INFO *cs=thd_charset();
+  uint32 l;
 
   if (Item_date_add_interval::get_date(&ltime,0))
     return 0;
   if (ltime.time_type == TIMESTAMP_DATE)
   {
-    if (str->alloc(11))
+    l=11*cs->mbmaxlen+32;
+    if (str->alloc(l))
       goto null_date;
-    sprintf((char*) str->ptr(),"%04d-%02d-%02d",
+    l=cs->snprintf(cs,(char*) str->ptr(),l,"%04d-%02d-%02d",
 	    ltime.year,ltime.month,ltime.day);
-    str->length(10);
+    str->length(l);
   }
   else
   {
-    if (str->alloc(20))
+    l=20*cs->mbmaxlen+32;
+    if (str->alloc(l))
       goto null_date;
-    sprintf((char*) str->ptr(),"%04d-%02d-%02d %02d:%02d:%02d",
+    l=cs->snprintf(cs,(char*) str->ptr(),l,"%04d-%02d-%02d %02d:%02d:%02d",
 	    ltime.year,ltime.month,ltime.day,
 	    ltime.hour,ltime.minute,ltime.second);
-    str->length(19);
+    str->length(l);
   }
+  str->set_charset(cs);
   return str;
 
  null_date: