Best Performance for Date Transform From http://vombat.tumblr.com/post/60530544401/date-parsing-performance-on-ios-nsdateformatter

data_transform

sqlite3_stmt *statement = NULL;
sqlite3_prepare_v2(db, "SELECT strftime('%s', ?);", -1, &statement, NULL);

sqlite3_bind_text(statement, 1, [dateString UTF8String], -1, SQLITE_STATIC);
sqlite3_step(statement);
sqlite3_int64 interval = sqlite3_column_int64(statement, 0);
NSDate *date = [NSDate dateWithTimeIntervalSince1970:interval];