Here are this year's dates of Uposatha days as observed by the two sects of Thai Buddhism (Dhammayutika and Mahanikaya).

  Full moon Last quarter moon New moon First quarter moon Full moon
January 3 11 18 26  
 
February 2 10 17* 25*  
 
March 3
Magha Puja
11 18 26  
 
April 2 10 17* 25*  
 
May 1 9 16 24 31
Visakha Puja
June  
 
8 15* 23* 29
July  
 
7 14 22 29
Asalha Puja
August  
 
6 13 21 28
September  
 
5 11 19 26
October  
 
4 11 19 26
Pavarana Day
November  
 
3 9 17 24
Anapanasati Day
December  
 
2 9 17 24

Dates marked with an asterisk (*) are one day behind the Thai Mahanikaya calendar.

Dates for the calendar were provided by Metta Forest Monastery.