Add convertHexDate to TimeUtil (#517)

NationalSecurityAgency · Jul 28, 2023 · 250c7bc · 250c7bc
1 parent 0b167a2
commit 250c7bc
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diff --git a/src/main/java/emissary/util/TimeUtil.java b/src/main/java/emissary/util/TimeUtil.java
@@ -1,13 +1,17 @@
 package emissary.util;
 
 import org.apache.commons.lang3.StringUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.time.DateTimeException;
 import java.time.Instant;
+import java.time.LocalDateTime;
 import java.time.ZoneId;
 import java.time.ZonedDateTime;
 import java.time.format.DateTimeFormatter;
 import java.time.format.DateTimeParseException;
+import java.time.temporal.ChronoUnit;
 import java.time.temporal.TemporalAccessor;
 import java.time.zone.ZoneRulesException;
 import java.util.Date;
@@ -20,7 +24,12 @@ public class TimeUtil {
     private static final DateTimeFormatter DATE_ISO_8601 = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss").withZone(GMT);
     private static final DateTimeFormatter DATE_FULL_ISO_8601 = DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ssX").withZone(GMT);
     private static final DateTimeFormatter DATE_ORDINAL = DateTimeFormatter.ofPattern("yyyyDDD").withZone(GMT);
+    private static final DateTimeFormatter DATE_ISO_8601_SSS = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss.SSS");
     private static final String ISO_8601_TIME_DATE_STRING = "yyyy-MM-dd'T'HH:mm:ss'Z'";
+    private static final int HEX_PREFIX_LEN = "0x".length();
+    private static final int HEX_RADIX = 16;
+    private static final LocalDateTime STARTING_DATE = LocalDateTime.parse("1900-01-01 00:00:00.000", DATE_ISO_8601_SSS);
+    private static final Logger logger = LoggerFactory.getLogger(TimeUtil.class);
 
     /**
      * Get the application configured timezone
@@ -232,6 +241,35 @@ public static ZonedDateTime getZonedDateFromISO8601(@Nullable final String dateS
         return dateString == null ? null : ZonedDateTime.parse(dateString, DATE_ISO_8601);
     }
 
+    /**
+     * Parses hex date string into formatted string ("yyyy-MM-dd HH:mm:ss.SSS")
+     *
+     * @param hexDate hex string representation of the date
+     * @return converted time in string format yyyy-MM-dd HH:mm:ss.SSS
+     * @throws DateTimeParseException if could not parse date
+     *
+     */
+    public static String convertHexDate(String hexDate) {
+        String hexNumber = hexDate.substring(HEX_PREFIX_LEN);
+        String dateHex = hexNumber.substring(0, 8);
+        String timeHex = hexNumber.substring(8, 16);
+
+        long daysToAdd = Long.parseLong(dateHex, HEX_RADIX);
+        long millisToAdd = Math.round(Long.parseLong(timeHex, HEX_RADIX) * 10 / 3.0);
+
+        LocalDateTime ldt;
+
+        try {
+            ldt = STARTING_DATE.plusDays(daysToAdd);
+            ldt = ldt.plus(millisToAdd, ChronoUnit.MILLIS);
+        } catch (DateTimeParseException ex) {
+            logger.debug("Could not parse date", ex);
+            throw ex;
+        }
+
+        return ldt.format(DATE_ISO_8601_SSS);
+    }
+
     public static String getISO8601DateFormatString() {
         return ISO_8601_TIME_DATE_STRING;
     }

diff --git a/src/test/java/emissary/util/TimeUtilTest.java b/src/test/java/emissary/util/TimeUtilTest.java
@@ -156,4 +156,12 @@ void testDateAsFullIOS8601() {
         assertTrue(time.contains("T"), "Full ISO8601 must have a 'T'");
         assertTrue(time.contains("Z"), "Full ISO8601 must have a 'Z'");
     }
+
+    @Test
+    void testConvertHexDate() {
+        String cellContents = "0x00009FF700F77536";
+        String cellContents2 = "0x0000A07800E93033";
+        assertEquals("2012-02-14 15:00:57.993", TimeUtil.convertHexDate(cellContents), "convertHexDate did not match");
+        assertEquals("2012-06-22 14:09:00.757", TimeUtil.convertHexDate(cellContents2), "convertHexDate did not match");
+    }
 }