From 337c5189dd7bdbab102e167dd8c502c144ad4756 Mon Sep 17 00:00:00 2001
From: nhmall <nhmall@nethack.org>
Date: Mon, 13 Apr 2026 06:39:54 -0400
Subject: [PATCH] store relative timestamps in save and bones

---
 include/extern.h |  2 ++
 src/restore.c    | 10 +++++++++-
 src/save.c       | 27 ++++++++++++++++++++++++++-
 3 files changed, 37 insertions(+), 2 deletions(-)

diff --git a/include/extern.h b/include/extern.h
index 67a938731..fe1b93b1b 100644
--- a/include/extern.h
+++ b/include/extern.h
@@ -2827,6 +2827,8 @@ extern void freedynamicdata(void);
 extern void store_savefileinfo(NHFILE *) NONNULLARG1;
 extern void store_savefileinfo(NHFILE *) NONNULLARG1;
 extern int nhdatatypes_size(void);
+extern void moves_to_relative_time(long *);
+extern void relative_time_to_moves(long *);
 #if 0
 extern void assignlog(char *, char*, int);
 extern FILE *getlog(NHFILE *);
diff --git a/src/restore.c b/src/restore.c
index 191db7ddd..8f131d111 100644
--- a/src/restore.c
+++ b/src/restore.c
@@ -35,6 +35,7 @@ staticfn boolean restgamestate(NHFILE *);
 staticfn void rest_bubbles(NHFILE *);
 staticfn void restore_gamelog(NHFILE *);
 staticfn void restore_msghistory(NHFILE *);
+staticfn void rest_adjust_levelflags(void);
 #endif
 
 /*
@@ -1106,7 +1107,7 @@ getlev(NHFILE *nhfp, int pid, xint8 lev)
     Sfi_dest_area(nhfp, &svu.updest, "lev-updest");
     Sfi_dest_area(nhfp, &svd.dndest, "lev-dndest");
     Sfi_levelflags(nhfp, &svl.level.flags, "lev-level_flags");
-
+    rest_adjust_levelflags();
     if (svd.doors) {
         free(svd.doors);
         svd.doors = 0;
@@ -1302,6 +1303,13 @@ getlev(NHFILE *nhfp, int pid, xint8 lev)
     program_state.in_getlev = FALSE;
 }
 
+void
+rest_adjust_levelflags(void)
+{
+    /* adjust timestamps */
+    relative_time_to_moves(&svl.level.flags.stasis_until);
+}
+
 /* "name-role-race-gend-algn" occurs very early in a save file; sometimes we
    want the whole thing, other times just "name" (for svp.plname[]) */
 void
diff --git a/src/save.c b/src/save.c
index a7ea05e7a..e2c0ac5f9 100644
--- a/src/save.c
+++ b/src/save.c
@@ -31,7 +31,7 @@ staticfn void save_gamelog(NHFILE *);
 staticfn void savegamestate(NHFILE *);
 staticfn void savelev_core(NHFILE *, xint8);
 staticfn void save_msghistory(NHFILE *);
-
+staticfn void save_adjust_levelflags(void);
 #if defined(HANGUPHANDLING)
 #define HUP if (!program_state.done_hup)
 #else
@@ -509,7 +509,9 @@ savelev_core(NHFILE *nhfp, xint8 lev)
     save_stairs(nhfp);
     Sfo_dest_area(nhfp, &svu.updest, "lev-updest");
     Sfo_dest_area(nhfp, &svd.dndest, "lev-dndest");
+    save_adjust_levelflags();
     Sfo_levelflags(nhfp, &svl.level.flags, "lev-level_flags");
+    rest_adjust_levelflags();
 
     Sfo_int(nhfp, &svd.doors_alloc, "lev-doors_alloc");
     /* don't rely on underlying write() behavior to write
@@ -556,6 +558,13 @@ savelev_core(NHFILE *nhfp, xint8 lev)
     return;
 }
 
+void
+save_adjust_levelflags(void)
+{
+    /* adjust any timestamps */
+    moves_to_relative_time(&svl.level.flags.stasis_until);
+}
+
 staticfn void
 savelevl(NHFILE *nhfp)
 {
@@ -1033,6 +1042,22 @@ save_msghistory(NHFILE *nhfp)
     /* note: we don't attempt to handle release_data() here */
 }
 
+void
+moves_to_relative_time(long *timestamp)
+{
+    long prevts = *timestamp;
+
+    *timestamp = prevts - svm.moves;
+}
+
+void
+relative_time_to_moves(long *timestamp)
+{
+    long prevts = *timestamp;
+
+    *timestamp = svm.moves + prevts;
+}
+
 /* also called by prscore(); this probably belongs in dungeon.c... */
 void
 free_dungeons(void)