diff --git a/.bashrc b/.bashrc
index 44733ae..f64b06c 100644
--- a/.bashrc
+++ b/.bashrc
@@ -32,6 +32,7 @@ alias t="telnet"
 export BLOCKSIZE="k"
 export EDITOR="vim"
 export GIT_PAGER="less"
+export HISTTIMEFORMAT="%y/%m/%d %T "
 export HOMEBREW_NO_ANALYTICS=1
 export LESS="-EfmrSwX"
 export LSCOLORS="gxfxcxdxbxegedabagacad"
diff --git a/.zshrc b/.zshrc
index 789105e..58b6bb4 100644
--- a/.zshrc
+++ b/.zshrc
@@ -112,6 +112,7 @@ export EDITOR="vim"
 export GIT_PAGER="less"
 export HISTFILE="$HOME/.history"
 export HISTSIZE=2000
+export HISTTIMEFORMAT="%y/%m/%d %T "
 export HOMEBREW_NO_ANALYTICS=1
 export LESS="-EfmrSwX"
 export LSCOLORS="gxfxcxdxbxegedabagacad"