date alternative on BSD variants including OSX

diff --git a/barcat b/barcat
index c2f41aa97c9365debb63be1ebdfd8d3b5003d19d..1c567f4f14c38b9f005f9cd8e25df80eea4deb9c 100755 (executable)
--- a/barcat
+++ b/barcat
@@ -389,7 +389,7 @@ Or the top 3 most frequent authors with statistics over all:
 
     git shortlog -sn | barcat -L3 -s
 
-Activity of the last days:
+Activity of the last days (substitute date C<-v-{}d> on BSD):
 
     ( git log --pretty=%ci --since=30day | cut -b-10
       seq 0 30 | xargs -i date +%F -d-{}day ) |