Timezone Support

src/main/java/ch/njol/skript/expressions/ExprAllTimezones.java

@@ -0,0 +1,53 @@
+package ch.njol.skript.expressions;
+
+import ch.njol.skript.Skript;
+import ch.njol.skript.doc.Description;
+import ch.njol.skript.doc.Example;
+import ch.njol.skript.doc.Name;
+import ch.njol.skript.doc.Since;
+import ch.njol.skript.lang.Expression;
+import ch.njol.skript.lang.ExpressionType;
+import ch.njol.skript.lang.SkriptParser.ParseResult;
+import ch.njol.skript.lang.util.SimpleExpression;
+import ch.njol.util.Kleenean;
+import org.bukkit.event.Event;
+import org.jetbrains.annotations.Nullable;
+
+import java.time.ZoneId;
+
+@Name("All Timezones")
+@Description("Returns a list of all timezones that can be used in the <a href='#ExprNow'>now</a> expression.")
+@Since("INSERT VERSION")
+@Example("set {_timezones::*} to all timezones")
+public class ExprAllTimezones extends SimpleExpression<String> {
+
+	static {
+		Skript.registerExpression(ExprAllTimezones.class, String.class, ExpressionType.SIMPLE, "all time[ ]zones");
+	}
+
+	@Override
+	public boolean init(Expression<?>[] expressions, int matchedPattern, Kleenean isDelayed, ParseResult parseResult) {
+		return true;
+	}
+
+	@Override
+	protected String @Nullable [] get(Event event) {
+		return ZoneId.getAvailableZoneIds().toArray(new String[0]);
+	}
+
+	@Override
+	public boolean isSingle() {
+		return false;
+	}
+
+	@Override
+	public Class<? extends String> getReturnType() {
+		return String.class;
+	}
+
+	@Override
+	public String toString(@Nullable Event event, boolean debug) {
+		return "all timezones";
+	}
+
+}

src/main/java/ch/njol/skript/expressions/ExprNow.java

@@ -1,38 +1,78 @@
 package ch.njol.skript.expressions;
 
+import ch.njol.skript.doc.*;
 import org.bukkit.event.Event;
 import org.jetbrains.annotations.Nullable;
 
 import ch.njol.skript.Skript;
-import ch.njol.skript.doc.Description;
-import ch.njol.skript.doc.Examples;
-import ch.njol.skript.doc.Name;
-import ch.njol.skript.doc.Since;
 import ch.njol.skript.lang.Expression;
 import ch.njol.skript.lang.ExpressionType;
 import ch.njol.skript.lang.SkriptParser.ParseResult;
 import ch.njol.skript.lang.util.SimpleExpression;
 import ch.njol.skript.util.Date;
 import ch.njol.util.Kleenean;
 
+import java.time.DateTimeException;
+import java.time.Instant;
+import java.time.ZoneId;
+import java.time.ZonedDateTime;
+
 @Name("Now")
-@Description("The current <a href='classes.html#date'>system time</a> of the server. Use <a href='#ExprTime'>time</a> to get the <a href='classes.html#time'>Minecraft time</a> of a world.")
-@Examples({"broadcast \"Current server time: %now%\""})
-@Since("1.4")
+@Description({
+	"The current <a href='classes.html#date'>system time</a> of the server. "
+		+ "Use <a href='#ExprTime'>time</a> to get the <a href='classes.html#time'>Minecraft time</a> of a world.",
+	"Optionally specify a timezone to get the current date at a timezone. The returned value might not be equal to"
+		+ "'now' without timezones. If a timezone is invalid no value will be returned.",
+	"Use <a href='#ExprAllTimezones'>all timezones</a> to get a list of valid timezones."
+})
+@Example("broadcast \"Current server time: %now%\"")
+@Example("""
+	set {_date} to now in timezone "Europe/Istanbul"
+	set {_clock} to {_date} formatted as "kk:mm"
+	send "It is currently %{_clock}% in Istanbul!" to player
+	""")
+@Since("1.4, INSERT VERSION (timezones)")
 public class ExprNow extends SimpleExpression<Date> {
 
 	static {
-		Skript.registerExpression(ExprNow.class, Date.class, ExpressionType.SIMPLE, "now");
+		Skript.registerExpression(ExprNow.class, Date.class, ExpressionType.SIMPLE, "now [timezone:in time[ ]zone %-string%]");
 	}
+
+	private boolean usingTimezone;
+	private Expression<String> timezone;
 
 	@Override
-	public boolean init(final Expression<?>[] exprs, final int matchedPattern, final Kleenean isDelayed, final ParseResult parseResult) {
+	public boolean init(Expression<?>[] exprs, int matchedPattern, Kleenean isDelayed, ParseResult parseResult) {
+		usingTimezone = parseResult.hasTag("timezone");
+		timezone = (Expression<String>) exprs[0];
 		return true;
 	}
 
 	@Override
-	protected Date[] get(final Event e) {
-		return new Date[] {new Date()};
+	protected Date[] get(Event event) {
+		if (usingTimezone) {
+			String timezone = this.timezone.getSingle(event);
+			if (timezone == null) {
+				return new Date[0];
+			}
+
+			ZoneId targetZoneId;
+			try {
+				targetZoneId = ZoneId.of(timezone);
+			} catch (DateTimeException e) { // invalid zone format
+				return new Date[0];
+			}
+
+			ZoneId localZoneId = ZoneId.systemDefault();
+			Instant shiftedNow = ZonedDateTime.now(targetZoneId)
+				.toLocalDateTime()
+				.atZone(localZoneId)
+				.toInstant();
+			java.util.Date javaDate = java.util.Date.from(shiftedNow);
+			Date date = Date.fromJavaDate(javaDate);
+			return new Date[]{ date };
+ 		}
+		return new Date[]{ new Date() };
 	}
 
 	@Override
@@ -46,8 +86,11 @@ public Class<? extends Date> getReturnType() {
 	}
 
 	@Override
-	public String toString(final @Nullable Event e, final boolean debug) {
+	public String toString(@Nullable Event event, boolean debug) {
+		if (usingTimezone) {
+			return "now in timezone " + timezone.toString(event, debug);
+		}
 		return "now";
 	}
-	
+
 }