Merge pull request AY2425S1-CS2113-W14-4#102 from philip1304/datetime…

…-class

DateTime // Implemented

src/main/java/seedu/pill/util/DateTime.java

@@ -0,0 +1,73 @@
+package seedu.pill.util;
+
+import java.time.LocalDateTime;
+import java.time.format.DateTimeFormatter;
+import java.time.temporal.ChronoUnit;
+
+public class DateTime implements Comparable<DateTime> {
+    private LocalDateTime dateTime;
+
+    public DateTime() {
+        this.dateTime = LocalDateTime.now();
+    }
+
+    public DateTime(LocalDateTime dateTime) {
+        this.dateTime = dateTime;
+    }
+
+    public LocalDateTime getDateTime() {
+        return dateTime;
+    }
+
+    public void setDateTime(LocalDateTime dateTime) {
+        this.dateTime = dateTime;
+    }
+
+    public String getFormattedDateTime(String format) {
+        DateTimeFormatter formatter = DateTimeFormatter.ofPattern(format);
+        return dateTime.format(formatter);
+    }
+
+    public String getFormattedDate() {
+        return getFormattedDateTime("yyyy-MM-dd");
+    }
+
+    public String getFormattedTime() {
+        return getFormattedDateTime("HH:mm:ss");
+    }
+
+    @Override
+    public int compareTo(DateTime other) {
+        return this.dateTime.compareTo(other.getDateTime());
+    }
+
+    public boolean isAfter(DateTime other) {
+        return this.compareTo(other) > 0;
+    }
+
+    public boolean isBefore(DateTime other) {
+        return this.compareTo(other) < 0;
+    }
+
+    public long getDaysUntil(DateTime other) {
+        return ChronoUnit.DAYS.between(this.dateTime, other.getDateTime());
+    }
+
+    public boolean isExpired(DateTime expirationDate) {
+        return this.isAfter(expirationDate);
+    }
+
+    public long getDaysUntilExpiration(DateTime expirationDate) {
+        return getDaysUntil(expirationDate);
+    }
+
+    public boolean isWithinRefillPeriod(int daysBeforeRefill) {
+        LocalDateTime refillDate = this.dateTime.plusDays(daysBeforeRefill);
+        return LocalDateTime.now().isAfter(refillDate);
+    }
+
+    @Override
+    public String toString() {
+        return getFormattedDateTime("yyyy-MM-dd HH:mm:ss");
+    }
+}