Fixed bug with GitLab where 1mo = 30d (#114).

src/main/java/org/gitlab4j/api/IssuesApi.java

@@ -33,6 +33,7 @@ import org.gitlab4j.api.GitLabApi.ApiVersion;
 import org.gitlab4j.api.models.Duration;
 import org.gitlab4j.api.models.Issue;
 import org.gitlab4j.api.models.TimeStats;
+import org.gitlab4j.api.utils.DurationUtils;
 
 /**
  * This class provides an entry point to all the GitLab API Issue calls.
@@ -347,7 +348,8 @@ public class IssuesApi extends AbstractApi implements Constants {
             throw new RuntimeException("issue IID cannot be null");
         }
 
-        GitLabApiForm formData = new GitLabApiForm().withParam("duration", duration, true);
+        String durationString = (duration != null ? DurationUtils.toString(duration.getSeconds(), false) : null);
+        GitLabApiForm formData = new GitLabApiForm().withParam("duration", durationString, true);
 
         Response response = post(Response.Status.OK, formData.asMap(), "projects", projectId, "issues", issueIid, "time_estimate");
         return (response.readEntity(TimeStats.class));
@@ -428,7 +430,8 @@ public class IssuesApi extends AbstractApi implements Constants {
             throw new RuntimeException("issue IID cannot be null");
         }
 
-        GitLabApiForm formData = new GitLabApiForm().withParam("duration", duration, true);
+        String durationString = (duration != null ? DurationUtils.toString(duration.getSeconds(), false) : null);
+        GitLabApiForm formData = new GitLabApiForm().withParam("duration", durationString, true);
 
         Response response = post(Response.Status.CREATED, formData.asMap(), "projects", projectId, "issues", issueIid, "add_spent_time");
         return (response.readEntity(TimeStats.class));

src/main/java/org/gitlab4j/api/utils/DurationUtils.java

@@ -23,14 +23,28 @@ public class DurationUtils {
      * @return a human readable string representing the duration
      */
     public static final String toString(int durationSeconds) {
+        return DurationUtils.toString(durationSeconds, true);
+    }
 
-        int months = durationSeconds / TIME_UNIT_MULTIPLIERS[0];
-        int weeks = (durationSeconds - months * TIME_UNIT_MULTIPLIERS[0]) / TIME_UNIT_MULTIPLIERS[1];
-        int days = (durationSeconds - months * TIME_UNIT_MULTIPLIERS[0] - weeks * TIME_UNIT_MULTIPLIERS[1]) / TIME_UNIT_MULTIPLIERS[2];
-        int seconds = durationSeconds - (months * TIME_UNIT_MULTIPLIERS[0]) - (weeks * TIME_UNIT_MULTIPLIERS[1]) - (days * TIME_UNIT_MULTIPLIERS[2]);
+    /**
+     * Create a human readable duration string from seconds.
+     *
+     * @param durationSeconds the total number of seconds in the duration
+     * @return a human readable string representing the duration
+     */
+    public static final String toString(int durationSeconds, boolean includeMonths) {
+
+        int seconds = durationSeconds;
+        int months = (includeMonths ? seconds / TIME_UNIT_MULTIPLIERS[0] : 0);
+        seconds -= months * TIME_UNIT_MULTIPLIERS[0];
+        int weeks = seconds / TIME_UNIT_MULTIPLIERS[1];
+        seconds -= weeks * TIME_UNIT_MULTIPLIERS[1];
+        int days = seconds / TIME_UNIT_MULTIPLIERS[2];
+        seconds -= days * TIME_UNIT_MULTIPLIERS[2];
         int hours = seconds / 3600;
-        int minutes = (seconds % 3600) / 60;
-        seconds = seconds % 60;
+        seconds -= hours * 3600;
+        int minutes = seconds / 60;
+        seconds -= minutes * 60;
 
         StringBuilder buf = new StringBuilder();
         if (months > 0) {

src/test/java/org/gitlab4j/api/TestDuration.java

@@ -102,5 +102,11 @@ public class TestDuration {
 
         duration = DurationUtils.toString(60 * 60 * 8 * 5 * 4 * 3 + 60 * 60 * 8 * 2 + 60 * 60 * 3 + 60 * 6 + 8);
         assertEquals("3mo2d3h6m8s", duration);
+
+        duration = DurationUtils.toString(60 * 60 * 8 * 5 * 5 + 60 * 60 * 8 * 2 + 60 * 60 * 3 + 60 * 4 + 5, false);
+        assertEquals("5w2d3h4m5s", duration);
+
+        duration = DurationUtils.toString(60 * 60 * 8 * 5 * 4 * 3 + 60 * 60 * 8 * 2 + 60 * 60 * 3 + 60 * 6 + 8, false);
+        assertEquals("12w2d3h6m8s", duration);
     }
 }