diff --git a/src/logmsg.c b/src/logmsg.c
index fb11a46..97139f8 100644
--- a/src/logmsg.c
+++ b/src/logmsg.c
@@ -17,6 +17,7 @@
 #include <igloo/logmsg.h>
 #include <igloo/interface.h>
 #include <igloo/objecthandler.h>
+#include <igloo/filter.h>
 #include <igloo/io.h>
 #include "private.h"
 
@@ -201,4 +202,89 @@ igloo_objecthandler_t   * igloo_logmsg_formarter(igloo_ro_t backend, const char
     return objecthandler;
 }
 
-igloo_filter_t          * igloo_logmsg_filter(igloo_loglevel_t level_min, igloo_loglevel_t level_max, igloo_logmsg_opt_t options_required, igloo_logmsg_opt_t options_absent, const struct timespec * ts_min, const struct timespec * ts_max, const char *cat, const char *name, igloo_ro_t associated);
+typedef struct {
+    igloo_loglevel_t level_min;
+    igloo_loglevel_t level_max;
+    igloo_logmsg_opt_t options_required;
+    igloo_logmsg_opt_t options_absent;
+    struct timespec ts_min;
+    struct timespec ts_max;
+    char *cat;
+} igloo_logmsg_filter_mask_t;
+
+static inline int __gt_timespec(struct timespec *a, struct timespec *b)
+{
+    return a->tv_sec > b->tv_sec || (a->tv_sec == b->tv_sec && a->tv_nsec > b->tv_nsec);
+}
+
+static igloo_filter_result_t __test(igloo_INTERFACE_BASIC_ARGS, igloo_ro_t object)
+{
+    igloo_logmsg_t *msg = igloo_RO_TO_TYPE(object, igloo_logmsg_t);
+    igloo_logmsg_filter_mask_t *mask = *backend_userdata;
+
+    if (!msg)
+        return igloo_FILTER_RESULT_DROP;
+
+    if (msg->level < mask->level_min || msg->level > mask->level_max)
+        return igloo_FILTER_RESULT_DROP;
+
+    if ((msg->options & mask->options_required) != mask->options_required || (msg->options & mask->options_absent))
+        return igloo_FILTER_RESULT_DROP;
+
+    if (__gt_timespec(&(mask->ts_min), &(msg->ts)) || __gt_timespec(&(msg->ts), &(mask->ts_max)))
+        return igloo_FILTER_RESULT_DROP;
+
+    if (mask->cat) {
+        if (!msg->cat)
+            return igloo_FILTER_RESULT_DROP;
+
+        if (strcmp(msg->cat, mask->cat) != 0)
+            return igloo_FILTER_RESULT_DROP;
+    }
+
+    return igloo_FILTER_RESULT_PASS;
+}
+
+static const igloo_filter_ifdesc_t igloo_logmsg_filter_ifdesc = {
+    igloo_INTERFACE_DESCRIPTION_BASE(igloo_filter_ifdesc_t),
+    .test = __test
+};
+
+igloo_filter_t          * igloo_logmsg_filter(igloo_loglevel_t level_min, igloo_loglevel_t level_max, igloo_logmsg_opt_t options_required, igloo_logmsg_opt_t options_absent, const struct timespec * ts_min, const struct timespec * ts_max, const char *cat, const char *name, igloo_ro_t associated)
+{
+    igloo_filter_t *filter;
+    igloo_logmsg_filter_mask_t *mask = calloc(1, sizeof(*mask));
+
+    if (!mask)
+        return NULL;
+
+    mask->level_min = level_min;
+    mask->level_max = level_max;
+    mask->options_required = options_required;
+    mask->options_absent = options_absent;
+
+    /* No else needed, as {0, 0} is already in the past. */
+    if (ts_min)
+        mask->ts_min = *ts_min;
+
+    if (ts_max) {
+        mask->ts_max = *ts_max;
+    } else {
+        /* BEFORE YEAR 2038 IMPORTANT REWRITE: Update date. */
+        mask->ts_max.tv_sec = 2145916800; /* this is 2038-01-01 */
+    }
+
+    if (cat) {
+        mask->cat = strdup(cat);
+        if (!mask->cat) {
+            free(mask);
+            return NULL;
+        }
+    }
+
+    filter = igloo_filter_new(&igloo_logmsg_filter_ifdesc, igloo_RO_NULL, mask, name, associated);
+    if (!filter) {
+        free(mask);
+    }
+    return filter;
+}