In what order were the Servants summoned for the 5th Holy Grail War? I know that Assassin was summoned after Caster, and in most cases, Saber is the last Servant to be summoned. (The exception is in Heaven's Feel if you count True Assassin's appearance as a separate summoning).

However, I am wondering about the order of summoning of all the Servants, and if possible, the approximate times in which they were summoned.

In the visual novel, the date is shown during cutscenes, and I am quite sure that Saber was summoned on the night of 29th of February 2004, as I remember that the date changed from 29/2 into 1/3 after Shirou returned home with Saber. This can be used to approximate when the Servants were summoned.
All of these are explained in the visual novels of Fate/stay night and Fate/hollow ataraxia.


First to be summoned was Berserker, two months before Saber.
Second to be summoned was Caster, one month before Saber.
Rider, Assassin and Lancer are summoned at around the same time, around ten days or so before Saber.
Archer is summoned two days before Saber.


By the way, Saber was summoned during the night between February 2nd and February 3rd.