Selecting a good day means choosing a lucky day for an important occasion so everything will run smoothly on that day.

For instance, selecting a good day for marriage so it is more likely to be held successfully and seamlessly. Similarly, good day for moving implies a smooth process on that day, with lesser chance of furniture loss or damage, or work injuries.

擇日目的在於為一件即將進行的重要事情選取一個良辰吉日，以令做事的過程得以順利。例如結婚擇日是令結婚當天的過程順利有序，又如搬屋擇日可令搬屋的過程順利以減低遺失或弄傷人員、傢私電器的情況等。

Regarding to choose a date to give birth by Cesarean-section, many outsiders or even some Metaphysic masters choose a red-word luck day on Chinese Almanac as a good day to give birth. This is absolutely wrong. The fortune luck or destiny of a person is based on his four pillars in Bazi, which is calculated by lots of formula and is dependent upon his birth date, but is not based on whether the day is good to give birth. Just as Bazi analysis cannot be carried out by looking up the Chinese Almanac of your birth year. Therefore, searching a good day for Cesarean-section is complicated as it involves lots of calculations and Bazi analysis on each specific day. But it is paramount to a person as the birth date has great lifelong influence on them.

而「嬰兒剖腹擇日」，外間不少人與行家也以為從通勝內選取一個紅字吉日便可為嬰兒剖腹誕生，但這是完全錯誤的！由於一個人誕生後的運程始終也要視乎該人的出生日期來斷定其八字運程一生的好壞，難度我們會用客人出生當年的通勝來看看運程嗎？故此，嬰兒剖腹擇日並非從通勝而來，而是透過分析無數的八字運程來計算出那一個日期與時間較為合適才能定斷的。

Short-term Purpose 短暫（做事）

Long-term Purpose 長遠