Insert current date and/or time, for Sublime

gistfile1.py

import sublime, sublime_plugin, datetime

#supports multiple selections/cursors

def replace_sel(view,edit,text):
  s = set()
  for r in view.sel():
      view.replace(edit, r, text)
      e = r.begin()+text.__len__()
      s.add(sublime.Region(e,e))
  view.sel().clear()
  for r in s:
    view.sel().add(r)

def cur_date():
  return datetime.datetime.now().strftime("%Y-%m-%d")

def cur_time():
  return datetime.datetime.now().strftime("%H:%M")

class InsertDateTimeCommand(sublime_plugin.TextCommand):
  def run(self, edit):
    replace_sel(self.view,edit,"[%s] [%s] " % (cur_date(), cur_time()))

class InsertDateCommand(sublime_plugin.TextCommand):
  def run(self, edit):
    replace_sel(self.view,edit,"[%s] " % cur_date())

class InsertTimeCommand(sublime_plugin.TextCommand):
  def run(self, edit):
    replace_sel(self.view,edit,"[%s] " % cur_time())

Some key bindings if you want:
[
{ "keys": ["ctrl+alt+d"], "command": "insert_date" },
{ "keys": ["ctrl+alt+e"], "command": "insert_date_time" },
{ "keys": ["ctrl+alt+f"], "command": "insert_time" }
]