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On my (Android) phone, messages are normally timestamped by receipt, but tapping the message reveals the timestamp of sending.
According to http://www.tomshardware.co.uk/forum/33715-39-time-stamp-messages the sending timestamp is set by the sender's network, not the sender's device (or application).
I assume there's an app to spoof SMS?
I took a phone call last evening, that revolved around me not receiving a text message on Saturday.
As I put my phone down I saw I had an unread message: the one that was supposedly sent on Saturday and it showed that that was when it was sent...
Against the date and time is a locked padlock symbol, which suggests that the date and time can be edited.