Improve timestamp function

1 files changed, 15 insertions, 1 deletions

diff --git a/functions/timestamp.fish b/functions/timestamp.fish
index 6ea08e2..6a4c0ed 100644
--- a/functions/timestamp.fish
+++ b/functions/timestamp.fish
@@ -1,4 +1,18 @@
+# Deal with timestamps using the date command
 function timestamp  --wraps "date" --description "Return current unix timestamp"
+  # Without argument it only prints the current timestamp
+  if test (count $argv) -gt 0
+    # If the argument if help or --help or -h, it prints usage.
+    if test "$argv[1]" = "--help" -o "$argv[1]" = "-h" -o "$argv[1]" = "help"
+      echo -e "timestamp [TIMESTAMP]\n"
+      echo "Print the current timestamp"
+      echo "Pass a timestamp to get the corresponding date, so timestamp (timestamp) = date."
+    else
+      # Convert the argument to ISO 8601 date
+      date --iso-8601=seconds -d @$argv[1]
+    end
+  else
     # The Unix timestamp is the number of seconds from 01 January 1970 (the unix epoch date)
-    date "%s"
+    date "+%s"
+  end
 end