Its not easy to show the time an sms text message was sent from your device, or sent from someone else to you. In ios7 and above its a little easier to get the time an sms text message was sent or received, there is a little trick to it (like there is for most things on iPhones and iPads)

Show the time an sms text message was sent

  • you just scroll to the message you want to see the information about
  • and swipe with one finger from the right to the left of the screen.

The messages will slide over towards the left of the device to show the time to the right of the messages :D

Sources: apple support