Use thread safe date time formatter

app/src/main/java/io/xpipe/app/util/DateTimeParseHelper.java

@@ -0,0 +1,41 @@
+package io.xpipe.app.util;
+
+import java.text.ParsePosition;
+import java.time.DateTimeException;
+import java.time.Instant;
+import java.time.LocalTime;
+import java.time.ZoneId;
+import java.time.format.DateTimeFormatter;
+import java.time.format.DateTimeFormatterBuilder;
+import java.time.temporal.TemporalQueries;
+import java.util.Locale;
+
+public class DateTimeParseHelper {
+
+    private final DateTimeFormatter formatter;
+
+    public DateTimeParseHelper(String pattern) {
+        this(pattern, Locale.US);
+    }
+
+    public DateTimeParseHelper(String pattern, Locale locale) {
+        this.formatter = new DateTimeFormatterBuilder()
+                .parseCaseInsensitive()
+                .parseLenient()
+                .appendPattern(pattern)
+                .toFormatter(locale);
+    }
+
+    public Instant parse(String text) {
+        var parsed = formatter.parse(text, new ParsePosition(0));
+        var date = parsed.query(TemporalQueries.localDate());
+        if (date == null) {
+            throw new DateTimeException("No date found in " + text);
+        }
+
+        var time = parsed.query(TemporalQueries.localTime());
+        return date.atTime(time != null ? time : LocalTime.MIDNIGHT)
+                .atZone(ZoneId.systemDefault())
+                .toInstant();
+    }
+}