diff --git a/src/sys/net/hasp_time.cpp b/src/sys/net/hasp_time.cpp
index 3ad66a0f..3a193049 100644
--- a/src/sys/net/hasp_time.cpp
+++ b/src/sys/net/hasp_time.cpp
@@ -110,9 +110,7 @@ String time_zone_to_possix(const char* timezone)
         case TZ_ASIA_RIYADH:
         case TZ_ETC_GMT__3:
         case TZ_EUROPE_ISTANBUL:
-        case TZ_EUROPE_KIROV:
         case TZ_EUROPE_MINSK:
-        case TZ_EUROPE_VOLGOGRAD:
             return "<+03>-3";
         case TZ_ASIA_TEHRAN:
             return "<+0330>-3:30";
@@ -283,9 +281,9 @@ String time_zone_to_possix(const char* timezone)
             return "<-03>3";
         case TZ_AMERICA_MIQUELON:
             return "<-03>3<-02>,M3.2.0,M11.1.0";
-        case TZ_AMERICA_GODTHAB:
         case TZ_AMERICA_NUUK:
-            return "<-03>3<-02>,M3.4.6/22,J365/25";
+        case TZ_AMERICA_GODTHAB:
+            return "<-02>2<-01>,M3.5.0/-1,M10.5.0/0";
         case TZ_AMERICA_BOA_VISTA:
         case TZ_AMERICA_CAMPO_GRANDE:
         case TZ_AMERICA_CARACAS:
@@ -482,10 +480,11 @@ String time_zone_to_possix(const char* timezone)
         case TZ_INDIAN_COMORO:
         case TZ_INDIAN_MAYOTTE:
             return "EAT-3";
-        case TZ_AFRICA_CAIRO:
         case TZ_AFRICA_TRIPOLI:
         case TZ_EUROPE_KALININGRAD:
             return "EET-2";
+        case TZ_AFRICA_CAIRO:
+            return "EET-2EEST,M4.5.5/0,M10.5.4/24";
         case TZ_EUROPE_CHISINAU:
             return "EET-2EEST,M3.5.0,M10.5.0/3";
         case TZ_ASIA_BEIRUT:
@@ -506,7 +505,7 @@ String time_zone_to_possix(const char* timezone)
             return "EET-2EEST,M3.5.0/3,M10.5.0/4";
         case TZ_ASIA_GAZA:
         case TZ_ASIA_HEBRON:
-            return "EET-2EEST,M3.5.6,M10.5.6";
+            return "EET-2EEST,M3.4.4/50,M10.4.4/50";
         case TZ_AMERICA_ATIKOKAN:
         case TZ_AMERICA_CANCUN:
         case TZ_AMERICA_CAYMAN:
@@ -577,8 +576,10 @@ String time_zone_to_possix(const char* timezone)
         case TZ_ASIA_PYONGYANG:
         case TZ_ASIA_SEOUL:
             return "KST-9";
+        case TZ_EUROPE_KIROV:
         case TZ_EUROPE_MOSCOW:
         case TZ_EUROPE_SIMFEROPOL:
+        case TZ_EUROPE_VOLGOGRAD:
             return "MSK-3";
         case TZ_AMERICA_CRESTON:
         case TZ_AMERICA_DAWSON: