DateFormats 추가

src/main/java/cokr/xit/foundation/util/DateFormats.java

@@ -0,0 +1,30 @@
+package cokr.xit.foundation.util;
+
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import java.util.HashMap;
+
+import cokr.xit.foundation.Assert;
+
+public class DateFormats {
+	private static final HashMap<String, SimpleDateFormat> dateFormats = new HashMap<>();
+
+	public String format(String pattern, Date date) {
+		if (date == null) return "";
+		return dateFormat(pattern).format(date);
+	}
+
+	private SimpleDateFormat dateFormat(String pattern) {
+		return dateFormats.computeIfAbsent(pattern, key -> new SimpleDateFormat(key));
+	}
+
+	public Date parse(String pattern, String str) {
+		if (Assert.isEmpty(str)) return null;
+
+		try {
+			return dateFormat(pattern).parse(str);
+		} catch (Exception e) {
+			throw Assert.runtimeException(e);
+		}
+	}
+}