Allow constructing a microsoft.sql.DateTimeOffset instance from a java.time.OffsetDateTime value

src/main/java/microsoft/sql/DateTimeOffset.java

@@ -72,6 +72,22 @@ private DateTimeOffset(java.sql.Timestamp timestamp, int minutesOffset) {
         assert 0 == this.utcMillis % 1000L : "utcMillis: " + this.utcMillis;
     }
 
+    /**
+     * Constructs a DateTimeOffset from an existing java.time.OffsetDateTime
+     *
+     * @param offsetDateTime
+     *        A java.time.OffsetDateTime value
+     * @apiNote DateTimeOffset represents values to 100 nanosecond precision. If the java.time.OffsetDateTime instance
+     * represents a value that is more precise,  the value is rounded to the nearest multiple of 100 nanoseconds. Values
+     * within 50 nanoseconds of the next second are rounded up to the next second.
+     */
+    private DateTimeOffset(java.time.OffsetDateTime offsetDateTime) {
+        int hundredNanos = ((offsetDateTime.getNano() + 50) / 100);
+        this.utcMillis = (offsetDateTime.toEpochSecond() * 1000) + (hundredNanos / HUNDRED_NANOS_PER_SECOND * 1000);
+        this.nanos = 100 * (hundredNanos % HUNDRED_NANOS_PER_SECOND);
+        this.minutesOffset = offsetDateTime.getOffset().getTotalSeconds() / 60;
+    }
+
     /**
      * Converts a java.sql.Timestamp value with an integer offset to the equivalent DateTimeOffset value
      * 
@@ -105,6 +121,20 @@ public static DateTimeOffset valueOf(java.sql.Timestamp timestamp, Calendar cale
                 (calendar.get(Calendar.ZONE_OFFSET) + calendar.get(Calendar.DST_OFFSET)) / (60 * 1000));
     }
 
+    /**
+     * Directly converts a {@link java.time.OffsetDateTime} value to an equivalent {@link DateTimeOffset} value
+     *
+     * @param offsetDateTime
+     *        A java.time.OffsetDateTime value
+     * @return The DateTimeOffset value of the input java.time.OffsetDateTime
+     * @apiNote DateTimeOffset represents values to 100 nanosecond precision. If the java.time.OffsetDateTime instance
+     * represents a value that is more precise,  the value is rounded to the nearest multiple of 100 nanoseconds. Values
+     * within 50 nanoseconds of the next second are rounded up to the next second.
+     */
+    public static DateTimeOffset valueOf(java.time.OffsetDateTime offsetDateTime) {
+        return new DateTimeOffset(offsetDateTime);
+    }
+
     /** formatted value */
     private String formattedValue = null;
 

src/test/java/com/microsoft/sqlserver/jdbc/datatypes/DataTypesTest.java

@@ -1935,6 +1935,17 @@ public void testGetLocalDateTimeUnstorable() throws Exception {
         }
     }
 
+    @Test
+    public void testDateTimeOffsetValueOfOffsetDateTime() throws Exception {
+        OffsetDateTime expected = OffsetDateTime.now().withSecond(58).withNano(0);
+        OffsetDateTime roundUp = expected.withSecond(57).withNano(999999950);
+        OffsetDateTime roundDown = expected.withSecond(58).withNano(49);
+
+        assertEquals(expected, DateTimeOffset.valueOf(expected).getOffsetDateTime());
+        assertEquals(expected, DateTimeOffset.valueOf(roundUp).getOffsetDateTime());
+        assertEquals(expected, DateTimeOffset.valueOf(roundDown).getOffsetDateTime());
+    }
+
     static LocalDateTime getUnstorableValue() throws Exception {
         ZoneId systemTimezone = ZoneId.systemDefault();
         Instant now = Instant.now();