1947/2490
           Onward. The present reign.
 

1956/2499
Miss Prapit Kuvanondha’s term of office as school Manager ended. Miss Pinn Hitasakdi was appointed as the school Manager.
1957/2500
On the 16^th August, there was a ceremony to dissolve Presbyterian Group in Thailand at Wattana Wittaya Academy’s Auditorium. The Presbyterian Group gave assets and staff to the Church of Christ in Thailand. The asset value given to the Church of Christ in Thailand was more than US$5,000 million.
1957/2500
Miss Ayada Kirinkul’s term of office as the school Principal ended. School Principal was the missionary’s position. So, Miss Ayada retired and Miss Prapit Kuvanondha was appointed as the Headmistress.
1958/2501
On the 30^th January 1958, there was a ceremony to lay the corner stone of Wattana Church Building. The ceremony was performed by Dr. Horace Ryburn, Dr. Kenneth E. Wells – the then Chairman of School Board together with the Church Session. The School Board asked Dr. Amos Chang, the famous architect to design the church building. Dr.Taylor M. Potter, the then Chairman of the Session oversaw the construction until finished in August 1958. The church building and equipments cost 700,000 baht, were offered by many church members. Part of the contribution was the amount that Dr.Thomas Heyward Hays gave to the School.  Mrs. McFarland donated an amount of money as a memorial to Phra Artvidhyakom. The money left from construction of school building and donations also contributed to the church construction. The offering ceremony was performed on the 21^st November 1958. Mrs. Tard Prateepasen presided over the ceremony.
1962/2505
There was a construction of building for primary classes.
1968/2511
There was a construction of three-storied multi-purpose school building (Science building for secondary classes).
1974/2517
There was a construction of a three-storied building called ‘Satavassanusorn Building’, replacing the first dormitory building (Jubilee Building), since Jubilee Building was dilapidated.
1974/2517
Miss Wandee Kuntawongse was appointed as the school Headmistress.
1975/2518
Miss Prapit Kuvanondha retired. Miss Wandee Kuntawongse began to work in the Headmistress office. Miss Pinyo Na Nakorn was appointed as the School Manager.
1979/2522
The School was elected from Ministry of Education to be awarded royal prize for secondary level.
1981/2524
There was a construction of ‘Panyakarn Library Building’. Money used to build the Library was the only rent received from letting approximately 25 rai of land to International School. After that, the school had no longer received any rent. 
1981/2524
Miss Pinyo Na Nakorn retired. Miss Wandee Kuntawongse was also appointed as the School Manager.
1984/2527
Mrs. Chantana Thuaksuban was appointed as Headmistress.
1985/2528
The School was elected from Ministry of Education to be awarded royal prize for secondary level for the second time.
1985/2528
Miss Wandee Kuntawongse retired. Miss Penpej Na Nakorn was appointed as School Manager.
1987/2530
There was a construction of building for primary classes (Ellinwood Building)
1987/2530
Miss Penpej Na Nakorn retired. Mrs. Chantana Thuaksuban was appointed as School Manager. Mrs. Sermsri Chaiyasate was appointed as Headmistress.
1989/2532
There was a construction of school refectory.
1990/2533
There was a construction of Wattana Sampan Gymnasium.
1993/2536
Mrs. Chantana Thuaksuban was appointed as the first School Director.
1995/2538
There was a construction of building for kindergarten level, the new Neilson Hayes Memorial Building. 
1995/2538
Mrs. Chantana Thuaksuban retired. Mrs. Sermsri Chaiyasate was appointed as the School Director. Mrs. Punmaha Wuthiwaropas was appointed as the School Principal.
1996/2539
The School was awarded royal prize “Golden Ganesh” from HRH Princess Mahachakri Siridhorn for the best chorus. The event was organized by Music Society of Thailand.
1997/2540
There was a construction of dormitory (Prapit Kuvanondha Building).
1998/2541
There was a construction of school waitress dormitory.
1998/2541
On the 5^th December 1998, Mrs. Sermsri Chaiyasate the School Director, Mrs. Punmaha Wuthiwaropas the Principal and a group of teachers in Wattana Wittaya Academy, total 15 people, were conferred royal decoration “Benjama Direkgunabhorn”.
1999/2542
The School was elected from Ministry of Education to be awarded royal prize for secondary level for the third time.
1999/2542 – 2003/2546
All three education levels of the School were accredited with standard of educational quality from The Office of Private Education Committee, Ministry of Education. 
2000/2543
On the 5^th December, a group of 27 teachers in Wattana Wittaya Academy was conferred royal decoration “Benjama Direkgunabhorn”.
2002/2545
On the 20^th December, Mrs. Sermsri Chaiyasate the School Director, Mrs. Punmaha Wuthiwaropas the Principal were awarded with “Senior Teacher” honoured pins and certificates at Dusidalai Hall, Chitralada Palace.
2003/2546
On the 5^th December, a group of 10 teachers in Wattana Wittaya Academy was conferred royal decoration “Benjama Direkgunabhorn”.
2004/2547
There was a construction of “130^th year Building”.
2004/2547
The Russian Ministry of Education and Ministry of National Culture invited Wattana Chorus to participate in international chorus festival “Moscow Sound”, in Moscow, Russia, between 19^th April and 3^rd May 2004. Wattana Chorus won 4 prizes, i.e.,  

§        First prize for cultural performance by singing “Lao Gratob Mai”, folk dance medley and “Sawadee”.

§        First prize for general performance on compulsory song, “Sound the Trumpet”

§        Performance on religious song or hymn.

2007/2550
A group of 10 teachers in Wattana Wittaya Academy was conferred royal decoration “Jatutatha Direkgunabhorn” and another 5 were conferred royal decoration “Benjama Direkgunabhorn”.
2007/2550
There was a construction of “Ayada Kirinkul Building”. The offering ceremony was performed on the 8^th November.