diff --git a/src/main/java/io/leonard/OpeningHoursEvaluator.java b/src/main/java/io/leonard/OpeningHoursEvaluator.java
new file mode 100644
index 00000000000..a6353d79df0
--- /dev/null
+++ b/src/main/java/io/leonard/OpeningHoursEvaluator.java
@@ -0,0 +1,217 @@
+package io.leonard;
+
+import ch.poole.openinghoursparser.*;
+
+import java.time.DayOfWeek;
+import java.time.LocalDateTime;
+import java.time.LocalTime;
+import java.util.*;
+import java.util.stream.Stream;
+
+import static ch.poole.openinghoursparser.RuleModifier.Modifier.*;
+
+public class OpeningHoursEvaluator {
+
+  private static final Set<RuleModifier.Modifier> CLOSED_MODIFIERS = Set.of(CLOSED, OFF);
+  private static final Set<RuleModifier.Modifier> OPEN_MODIFIERS = Set.of(OPEN, UNKNOWN);
+  private static final Map<WeekDay, DayOfWeek> weekDayToDayOfWeek =
+    Map.of(
+      WeekDay.MO, DayOfWeek.MONDAY,
+      WeekDay.TU, DayOfWeek.TUESDAY,
+      WeekDay.WE, DayOfWeek.WEDNESDAY,
+      WeekDay.TH, DayOfWeek.THURSDAY,
+      WeekDay.FR, DayOfWeek.FRIDAY,
+      WeekDay.SA, DayOfWeek.SATURDAY,
+      WeekDay.SU, DayOfWeek.SUNDAY);
+
+  // when calculating the next time the hours are open, how many days should you go into the future
+  // this protects against stack overflows when the place is never going to open again
+  private static final int MAX_SEARCH_DAYS = 365 * 10;
+
+  public static boolean isOpenAt(LocalDateTime time, List<Rule> rules) {
+    var closed = getClosedRules(rules);
+    var open = getOpenRules(rules);
+    return closed.noneMatch(rule -> timeMatchesRule(time, rule))
+      && open.anyMatch(rule -> rule.isTwentyfourseven() || timeMatchesRule(time, rule));
+  }
+
+  /**
+   * @return LocalDateTime in Optional, representing next closing time ; or empty Optional if place
+   * is either closed at time or never closed at all.
+   */
+  public static Optional<LocalDateTime> isOpenUntil(LocalDateTime time, List<Rule> rules) {
+    var closed = getClosedRules(rules);
+    var open = getOpenRules(rules);
+    if (closed.anyMatch(rule -> timeMatchesRule(time, rule))) return Optional.empty();
+    return getTimeRangesOnThatDay(time, open)
+      .filter(r -> r.surrounds(time.toLocalTime()))
+      .findFirst()
+      .map(r -> time.toLocalDate().atTime(r.end));
+  }
+
+  public static Optional<LocalDateTime> wasLastOpen(LocalDateTime time, List<Rule> rules) {
+    return isOpenIterative(time, rules, false, MAX_SEARCH_DAYS);
+  }
+
+  public static Optional<LocalDateTime> wasLastOpen(
+    LocalDateTime time, List<Rule> rules, int searchDays) {
+    return isOpenIterative(time, rules, false, searchDays);
+  }
+
+  public static Optional<LocalDateTime> isOpenNext(LocalDateTime time, List<Rule> rules) {
+    return isOpenIterative(time, rules, true, MAX_SEARCH_DAYS);
+  }
+
+  public static Optional<LocalDateTime> isOpenNext(
+    LocalDateTime time, List<Rule> rules, int searchDays) {
+    return isOpenIterative(time, rules, true, searchDays);
+  }
+
+  /**
+   * This is private function, this doc-string means only help onboard new devs.
+   *
+   * @param initialTime Starting point in time to search from.
+   * @param rules       From parser
+   * @param forward     Whether to search in future (true)? or in the past(false)?
+   * @param searchDays  Limit search scope in days.
+   * @return an Optional LocalDateTime
+   */
+  private static Optional<LocalDateTime> isOpenIterative(
+    final LocalDateTime initialTime,
+    final List<Rule> rules,
+    boolean forward,
+    final int searchDays) {
+
+    var nextTime = initialTime;
+    for (var iterations = 0; iterations <= searchDays; ++iterations) {
+      var open = getOpenRules(rules);
+      var closed = getClosedRules(rules);
+
+      var time = nextTime;
+      if (isOpenAt(time, rules)) return Optional.of(time);
+      else {
+
+        var openRangesOnThatDay = getTimeRangesOnThatDay(time, open);
+        var closedRangesThatDay = getTimeRangesOnThatDay(time, closed);
+
+        var endOfExclusion =
+          closedRangesThatDay
+            .filter(r -> r.surrounds(time.toLocalTime()))
+            .findFirst()
+            .map(r -> time.toLocalDate().atTime(forward ? r.end : r.start));
+
+        var startOfNextOpening =
+          forward
+            ? openRangesOnThatDay
+            .filter(range -> range.start.isAfter(time.toLocalTime()))
+            .min(TimeRange.startComparator)
+            .map(timeRange -> time.toLocalDate().atTime(timeRange.start))
+            : openRangesOnThatDay
+            .filter(range -> range.end.isBefore(time.toLocalTime()))
+            .max(TimeRange.endComparator)
+            .map(timeRange -> time.toLocalDate().atTime(timeRange.end));
+
+        var opensNextThatDay = endOfExclusion.or(() -> startOfNextOpening);
+        if (opensNextThatDay.isPresent()) {
+          return opensNextThatDay;
+        }
+
+        // if we cannot find time on the same day when the POI is open, we skip forward to the start
+        // of the following day and try again
+        nextTime =
+          forward
+            ? time.toLocalDate().plusDays(1).atStartOfDay()
+            : time.toLocalDate().minusDays(1).atTime(LocalTime.MAX);
+      }
+    }
+
+    return Optional.empty();
+  }
+
+  private static Stream<TimeRange> getTimeRangesOnThatDay(
+    LocalDateTime time, Stream<Rule> ruleStream) {
+    return ruleStream
+      .filter(rule -> timeMatchesDayRanges(time, rule.getDays()))
+      .filter(r -> !Objects.isNull(r.getTimes()))
+      .flatMap(r -> r.getTimes().stream().map(TimeRange::new));
+  }
+
+  private static Stream<Rule> getOpenRules(List<Rule> rules) {
+    return rules.stream()
+      .filter(
+        r -> {
+          var modifier = r.getModifier();
+          return modifier == null || OPEN_MODIFIERS.contains(modifier.getModifier());
+        });
+  }
+
+  private static Stream<Rule> getClosedRules(List<Rule> rules) {
+    return rules.stream()
+      .filter(
+        r -> {
+          var modifier = r.getModifier();
+          return modifier != null && CLOSED_MODIFIERS.contains(modifier.getModifier());
+        });
+  }
+
+  private static boolean timeMatchesRule(LocalDateTime time, Rule rule) {
+    return (timeMatchesDayRanges(time, rule.getDays())
+      || rule.getDays() == null
+      && dateMatchesDateRanges(time, rule.getDates()))
+      && nullToEntireDay(rule.getTimes()).stream()
+      .anyMatch(timeSpan -> timeMatchesHours(time, timeSpan));
+  }
+
+  private static boolean timeMatchesDayRanges(LocalDateTime time, List<WeekDayRange> ranges) {
+    return nullToEmptyList(ranges).stream().anyMatch(dayRange -> timeMatchesDay(time, dayRange));
+  }
+
+  private static boolean timeMatchesDay(LocalDateTime time, WeekDayRange range) {
+    // if the end day is null it means that it's just a single day like in "Th
+    // 10:00-18:00"
+    if (range.getEndDay() == null) {
+      return time.getDayOfWeek().equals(weekDayToDayOfWeek.getOrDefault(range.getStartDay(), null));
+    }
+    int ordinal = time.getDayOfWeek().ordinal();
+    return range.getStartDay().ordinal() <= ordinal && range.getEndDay().ordinal() >= ordinal;
+  }
+
+  private static boolean dateMatchesDateRanges(LocalDateTime time, List<DateRange> ranges) {
+    return nullToEmptyList(ranges).stream().anyMatch(dateRange -> dateMatchesDateRange(time, dateRange));
+  }
+
+  private static boolean dateMatchesDateRange(LocalDateTime time, DateRange range) {
+    // if the end date is null it means that it's just a single date like in "2020 Aug 11"
+    DateWithOffset startDate = range.getStartDate();
+    boolean afterStartDate = time.getYear() >= startDate.getYear() && time.getMonth().ordinal() >= startDate.getMonth().ordinal() && time.getDayOfMonth() >= startDate.getDay();
+    if (range.getEndDate() == null) {
+      return afterStartDate;
+    }
+    DateWithOffset endDate = range.getEndDate();
+    boolean beforeEndDate = time.getYear() <= endDate.getYear() && time.getMonth().ordinal() <= endDate.getMonth().ordinal() && time.getDayOfMonth() <= endDate.getDay();
+    return afterStartDate && beforeEndDate;
+  }
+
+  private static boolean timeMatchesHours(LocalDateTime time, TimeSpan timeSpan) {
+    var minutesAfterMidnight = minutesAfterMidnight(time.toLocalTime());
+    return timeSpan.getStart() <= minutesAfterMidnight && timeSpan.getEnd() >= minutesAfterMidnight;
+  }
+
+  private static int minutesAfterMidnight(LocalTime time) {
+    return time.getHour() * 60 + time.getMinute();
+  }
+
+  private static <T> List<T> nullToEmptyList(List<T> list) {
+    if (list == null) return Collections.emptyList();
+    else return list;
+  }
+
+  private static List<TimeSpan> nullToEntireDay(List<TimeSpan> span) {
+    if (span == null) {
+      var allDay = new TimeSpan();
+      allDay.setStart(TimeSpan.MIN_TIME);
+      allDay.setEnd(TimeSpan.MAX_TIME);
+      return List.of(allDay);
+    } else return span;
+  }
+}
\ No newline at end of file
diff --git a/src/main/java/io/leonard/TimeRange.java b/src/main/java/io/leonard/TimeRange.java
new file mode 100644
index 00000000000..3fb85f8930c
--- /dev/null
+++ b/src/main/java/io/leonard/TimeRange.java
@@ -0,0 +1,27 @@
+package io.leonard;
+
+import ch.poole.openinghoursparser.TimeSpan;
+import java.time.LocalTime;
+import java.util.Comparator;
+
+public class TimeRange {
+
+  public final LocalTime start;
+  public final LocalTime end;
+
+  public TimeRange(TimeSpan span) {
+    this.start = LocalTime.ofSecondOfDay(span.getStart() * 60L);
+    this.end =
+      LocalTime.ofSecondOfDay(Math.min(span.getEnd() * 60L, LocalTime.MAX.toSecondOfDay()));
+  }
+
+  public boolean surrounds(LocalTime time) {
+    return time.isAfter(start) && time.isBefore(end);
+  }
+
+  public static Comparator<TimeRange> startComparator =
+    Comparator.comparing(timeRange -> timeRange.start);
+
+  public static Comparator<TimeRange> endComparator =
+    Comparator.comparing(timeRange -> timeRange.end);
+}
\ No newline at end of file