Keep a running time log or journal in Evernote. Add to it by texting yourself (using voice input if you like). This video demonstrates the concept and concludes important information.
If
New SMS sent to phone number
This Trigger fires every time you send an SMS on your Android device to a phone number you specify.
Then
Append to note
This Action will append to a note as determined by its title and notebook. Once a note’s size reaches 2MB a new note will be created.
Discover more time saving integrations for Evernote and Android SMS