Use this feature to extend or restrict sending times outside default country settings. i.e Between 1AM and 3AM = 2 Hours Sending Time, Between 3AM and 2AM = 23 Hours Sending Time, Between 3AM and 3AM = 24 Hours Sending Time.
To set this feature:
1 - Navigate to My Settings
2 - Select SMS Settings
3 - Navigate to the country for which you wish to extend or restrict sending times for. Select Yes for Country Time Override.
4 - Designate a timezone, then select what time SMS's should be sent between.