John 11:9  "Jesus answered, 'Are there not twelve hours in the day? ...' [Daylight Portion as witnssed in the Gospels]"
Calendar should be adjusted for Daylight Saving Time with the Day beginning at 7:00 PM , otherwise the day begins at 6:00 PM.

  Genesis 1:5  And God called the light Day, and the darkness he called Night. And the evening and the morning were the first day.

  The 24 hour day begins at evening and ends at evening.
 

 
 Passover* April 6
 Unleavened Bread April 7-13
 Pentecost May 27
 Trumpets Sept. 17
 Atonement Sept 26
 Tabernacles Oct. 1-7
 Last Great Day Oct. 8

  *Observed the evening before at sundown
 

 Passover* March 25
 Unleavened Bread March 26 April 1
 Pentecost May 19
 Trumpets Sept. 5
 Atonement Sept. 14
 Tabernacles Sept 19-25
 Last Great Day Sept. 26

  *Observed the evening before at sundown
 

 
 Passover* April 14
 Unleavened Bread April 15-21
 Pentecost June 8
 Trumpets Sept. 25
 Atonement Oct 4
 Tabernacles Oct. 9-15
 Last Great Day Oct. 16

  *Observed the evening before at sundown