Śrīmad-Bhāgavatam 12.2.33
యస్మిన్ కృష్ణో దివం యాతస్తస్మిన్నేవ తదాహని ।
ప్రతిపన్నం కలియుగమితి ప్రాహు: పురావిద: ॥ ౩౩ ॥
yasmin kṛṣṇo divaṁ yātas
[yasmin krishno divam yaatas]
tasminn eva tadāhani
[tasminn eva tadaahani]
pratipannaṁ kali-yugam
[pratipannam kali-yugam]
iti prāhuḥ purā-vidaḥ
[iti praahuh puraa-vidah]
Word-for-word
yasmin
—
on which
kṛṣṇaḥ
—
Lord Śrī Kṛṣṇa
divam
—
to the spiritual world
yātaḥ
—
gone
tasmin
—
on that
eva
—
same
tadā
—
then
ahani
—
day
pratipannam
—
obtained
kali-yugam
—
the Age of Kali
iti
—
thus
prāhuḥ
—
they say
purā
—
of the past
vidaḥ
—
the experts.
Blended reading (Sanskrit + English inline)
yasmin kṛṣṇo divaṁ yātas
yasmin
on which
kṛṣṇaḥ
Lord Śrī Kṛṣṇa
divam
to the spiritual world
yātaḥ
gone
tasminn eva tadāhani
tasmin
on that
eva
same
tadā
then
ahani
day
pratipannaṁ kali-yugam
pratipannam
obtained
kali-yugam
the Age of Kali
iti prāhuḥ purā-vidaḥ
iti
thus
prāhuḥ
they say
purā
of the past
vidaḥ
the experts.
Those who scientifically understand the past declare that on the very day that Lord Śrī Kṛṣṇa departed for the spiritual world, the influence of the Age of Kali began.
Purport
Although technically Kali-yuga was to begin during the time of Lord Kṛṣṇa’s presence on earth, this fallen age had to wait meekly for the departure of the Supreme Personality of Godhead.
— A.C. Bhaktivedanta Swami Prabhupāda
Gauḍīya Ācāryas
Viśvanātha Cakravartī Ṭhākura
Gauḍīya
Translation
The ancients with knowledge have declared that on the very day that Kṛṣṇa departed for the spiritual world, the influence of the age of Kali began.
“Well, some recent speculators have said that Kṛṣṇa made his appearance in the first sandhyā of Kali-yuga.” This verse refutes that theory. The general rule is that next yuga enters during the concluding part of the closing sandhyā (called a sandhyāṁśa) of the previous yuga. However, because of the influence of Kṛṣṇa, Kali could not have any effect at that time.
My note
Source: vedabase.io