* GC option `--max-atime' that specifies an upper limit to the last

  accessed time of paths that may be deleted.  Anything more recently
  used won't be deleted.  The time is specified in time_t,
  e.g. seconds since 1970-01-01 00:00:00 UTC; use `date +%s' to
  convert to time_t from the command line. 

  Example: to delete everything that hasn't been used in the last two
  months:

  $ nix-store --gc -v --max-atime $(date +%s -d "2 months ago")
  

1 files changed, 4 insertions, 0 deletions

diff --git a/src/libstore/store-api.hh b/src/libstore/store-api.hh
index 3c32003cb49c..ed7e60146029 100644
--- a/src/libstore/store-api.hh
+++ b/src/libstore/store-api.hh
@@ -75,6 +75,10 @@ struct GCOptions
        atime. */
     bool useAtime;
 
+    /* Do not delete paths newer than `maxAtime'.  -1 means no age
+       limit. */
+    time_t maxAtime;
+
     GCOptions();
 };