--- a/src/ngx_http_echo_timer.c	2022-08-01 01:52:01.000000000 +0200
+++ b/src/ngx_http_echo_timer.c	2026-10-17 21:54:22.312232452 +0200
@@ -33,8 +33,17 @@ ngx_http_echo_timer_elapsed_variable(ngx
     }
 
     if (ctx->timer_begin.sec == 0) {
+#if defined(freenginx)
+        /* freenginx only keeps the monotonic request start time */
+        tp = ngx_timeofday();
+        ms = (ngx_msec_int_t) (ngx_current_msec - r->start_time);
+        ms = (ngx_msec_int_t) tp->sec * 1000 + tp->msec - ms;
+        ctx->timer_begin.sec  = ms / 1000;
+        ctx->timer_begin.msec = (ngx_msec_t) (ms % 1000);
+#else
         ctx->timer_begin.sec  = r->start_sec;
         ctx->timer_begin.msec = (ngx_msec_t) r->start_msec;
+#endif
     }
 
     /* force the ngx timer to update */