nvim: add "datestamp" snippet

src/.config/nvim/ultisnips/all.snippets

@@ -3,7 +3,13 @@ snippet shrug "shrug emoticon"
 endsnippet
 
 snippet timestamp "unix time for today"
-`date -d "$(date +"%Y-%m-%d 15:45")" +%s`
+`date -d "$(date +"%Y-%m-%d")" +%s`
+endsnippet
+snippet "datestamp (.*)" "unix time (YYYY-MM-DD)" r
+`!p
+from time import mktime, strptime
+snip.rv = int(mktime(strptime(match.group(1), "%Y-%m-%d")))
+`
 endsnippet
 
 snippet today "normal formatted date for today" i