Fix some Forbidden APIs errors

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1700645 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/poi/ss/formula/functions/DateFunc.java

@@ -20,6 +20,7 @@ package org.apache.poi.ss.formula.functions;
 import java.util.Calendar;
 import java.util.GregorianCalendar;
 import java.util.Locale;
+import java.util.TimeZone;
 
 import org.apache.poi.ss.formula.eval.ErrorEval;
 import org.apache.poi.ss.formula.eval.EvaluationException;
@@ -30,10 +31,13 @@ import org.apache.poi.ss.usermodel.DateUtil;
 
 /**
  * Implementation for the Excel function DATE
- *
- * @author Pavel Krupets (pkrupets at palmtreebusiness dot com)
  */
 public final class DateFunc extends Fixed3ArgFunction {
+    /**
+     * Excel doesn't store TimeZone information in the file, so if in doubt,
+     *  use UTC to perform calculations
+     */
+    private static final TimeZone DEFAULT_TIMEZONE = TimeZone.getTimeZone("UTC");
 
 	public static final Function instance = new DateFunc();
 
@@ -87,7 +91,7 @@ public final class DateFunc extends Fixed3ArgFunction {
 		}
 
 		// Turn this into a Java date
-		Calendar c = new GregorianCalendar(Locale.ROOT);
+		Calendar c = new GregorianCalendar(DEFAULT_TIMEZONE, Locale.ROOT);
 		c.set(year, month, day, 0, 0, 0);
 		c.set(Calendar.MILLISECOND, 0);
 		

src/java/org/apache/poi/ss/formula/functions/Today.java

@@ -20,6 +20,7 @@ package org.apache.poi.ss.formula.functions;
 import java.util.Calendar;
 import java.util.GregorianCalendar;
 import java.util.Locale;
+import java.util.TimeZone;
 
 import org.apache.poi.ss.formula.eval.NumberEval;
 import org.apache.poi.ss.formula.eval.ValueEval;
@@ -27,14 +28,16 @@ import org.apache.poi.ss.usermodel.DateUtil;
 
 /**
  * Implementation of Excel TODAY() Function<br/>
- *
- * @author Frank Taffelt
  */
 public final class Today extends Fixed0ArgFunction {
+    /**
+     * Excel doesn't store TimeZone information in the file, so if in doubt,
+     *  use UTC to perform calculations
+     */
+    private static final TimeZone DEFAULT_TIMEZONE = TimeZone.getTimeZone("UTC");
 
 	public ValueEval evaluate(int srcRowIndex, int srcColumnIndex) {
-
+		Calendar now = new GregorianCalendar(DEFAULT_TIMEZONE, Locale.ROOT);
-		Calendar now = new GregorianCalendar(Locale.ROOT);
 		now.set(now.get(Calendar.YEAR), now.get(Calendar.MONTH), now.get(Calendar.DATE),0,0,0);
 		now.set(Calendar.MILLISECOND, 0);
 		return new NumberEval(DateUtil.getExcelDate(now.getTime()));

src/java/org/apache/poi/ss/usermodel/DateUtil.java

@@ -61,7 +61,10 @@ public class DateUtil {
     //  elapsed time patterns: [h],[m] and [s]
     private static final Pattern date_ptrn4 = Pattern.compile("^\\[([hH]+|[mM]+|[sS]+)\\]");
 
-    // only get this static info once (because operations are not really cheap)
+    /**
+     * Excel doesn't store TimeZone information in the file, so if in doubt,
+     *  use UTC to perform calculations
+     */
     private static final TimeZone TIMEZONE_UTC = TimeZone.getTimeZone("UTC");
 
 
@@ -84,7 +87,7 @@ public class DateUtil {
      * @param use1904windowing Should 1900 or 1904 date windowing be used?
      */
     public static double getExcelDate(Date date, boolean use1904windowing) {
-        Calendar calStart = new GregorianCalendar(Locale.ROOT);
+        Calendar calStart = new GregorianCalendar(TIMEZONE_UTC, Locale.ROOT);
         calStart.setTime(date);   // If date includes hours, minutes, and seconds, set them to 0
         return internalGetExcelDate(calStart, use1904windowing);
     }
@@ -322,7 +325,7 @@ public class DateUtil {
         if (timeZone != null) {
             calendar = new GregorianCalendar(timeZone, Locale.ROOT);
         } else {
-            calendar = new GregorianCalendar(Locale.ROOT); // using default time-zone
+            calendar = new GregorianCalendar(TIMEZONE_UTC, Locale.ROOT); // using default time-zone
         }
         setCalendar(calendar, wholeDays, millisecondsInDay, use1904windowing, roundSeconds);
         return calendar;