Merge pull request #5 from ShimmerEngineering/NEUR_659

NEUR-659

Author: JongChern

ShimmerDriver/src/main/java/com/shimmerresearch/driverUtilities/UtilShimmer.java

@@ -13,6 +13,9 @@
 import java.text.DecimalFormat;
 import java.text.ParseException;
 import java.text.SimpleDateFormat;
+import java.time.Instant;
+import java.time.ZoneId;
+import java.time.ZoneOffset;
 import java.util.ArrayList;
 import java.util.Calendar;
 import java.util.Collections;
@@ -714,6 +717,17 @@ public static String getCurrentDateAndTimeFormatted(){
 		return formattedDateAndTime;
 	}
 
+	/** Returns the current local timezone offset in milliseconds, taking into account DST */
+	public static int getCurrentLocalTimezoneOffsetMillis() {
+		return ZoneId.systemDefault().getRules().getOffset(Instant.now()).getTotalSeconds()*1000;
+	}
+	
+	/** Returns the current local timezone offset in milliseconds for a specific date (Unix Time, milliseconds), taking into account DST */
+	public static int getLocalTimezoneOffsetMillisForSpecificDate(long unixTimeMillis) {
+		Instant instant = Instant.ofEpochMilli(unixTimeMillis);
+		return ZoneId.systemDefault().getRules().getOffset(instant).getTotalSeconds()*1000;
+	}
+	
 	public static File[] getArrayOfFilesWithFileType(File directory, final String fileType){
 		File[] listOfFiles = directory.listFiles(new FilenameFilter() {
 	        @Override