Question: When did Grammar school that Michael Handley was educated at convert to academy status?

Context paragraphs:
Rainham Mark Grammar School: Rainham Mark Grammar School (previously known as Gillingham Grammar School) is the only co-educational selective grammar school in the Medway, Kent, England area.  The school also has academy status, with Twydall Primary School.  The school is currently led by Simon Decker.  It delivers pupils a great opportunity of good grades by helping them achieve their maximum potential.

Wilmington Grammar School for Boys: Wilmington Grammar School for Boys (WGSB) is a grammar school with academy status in Wilmington, Kent.  The school, which from 1954 to 1982 was called Dartford Technical High School, is a specialist Engineering school with a strong emphasis on Design Technology, Mathematics and Physics.  The uniform consists of blue blazers, white shirts, grey trousers and different ties for each house within the school. .  Suits are worn in the sixth form.  The school is situated directly alongside Wilmington Academy and has a bus service that also serves Dartford Grammar School for Girls, Dartford Grammar School, Wilmington Grammar School for Girls and Wilmington Academy.

Chatham Grammar School for Boys: Holcombe Grammar School (formally Chatham Grammar School for Boys) is a grammar school with academy status in Chatham, Kent, England.  It is a selective school.  From the 2017-18 academic year, the school planned to become co-educational and remain selective in the lower school.  This was blocked - and later approved - by the Department for Education with co-educational admission desired for the 2018/19 school year.  The school has changed name in advance of becoming co-educational and plans to change all references from "Chatham Grammar School for Boys" to "Holcombe Grammar School" over academic year 2016/17.

Wilmington Grammar School for Girls: Wilmington Grammar School for Girls, WGSG (Previously known as the Grammar School for Girls Wilmington) is a grammar school with academy status in Wilmington, Kent, England.  The uniform consists of maroon blazers, maroon jumpers and skirts/black trousers, with blue shirts.  The school is a member of the WHS partnership, so has a close relationship with the next-door Wilmington Grammar School for Boys, as well as Wilmington Academy and Oasis Academy Hextable.

Michael Handley: Handley was educated at Spalding Grammar School; Selwyn College, Cambridge; and Chichester Theological College.  After a curacy at Thorpe St Andrew he was Anglican Priest on the Fairstead Estate from 1966 to 1972.  He was Vicar of Hellesdon from 1972 to 1981; Rural Dean of Norwich North from 1979 to 1981; Archdeacon of Norwich from 1981 to 1993; and Archdeacon of Norfolk from 1993 to 2002.

Pate's Grammar School: Pate's Grammar School is a grammar school academy status located in the Hesters Way area Cheltenham, Gloucestershire, England.  It caters for pupils aged 11 to 18 and is a Beacon school.  The school was founded with a fund bestowed to Corpus Christi College, Oxford by Richard Pate in 1574.  The school became co-educational in 1986, when Pate's Grammar School for Girls merged with Cheltenham Grammar School.  In fact, the first female pupils came to the (Boys) Grammar School in 1971/72 to take their A-levels in the 6th form, and vice versa.

Rochester Grammar School: Rochester Grammar School (known as Rochester Grammar School for Girls until 2006) is a grammar school for the education of girls between the ages of 11 and 18.  It has academy status.  Pupils are expected to perform highly throughout the school.  It is now known as just "Rochester Grammar School" following the introduction of boys into the sixth form.

Borden Grammar School: Borden Grammar School is a selective boys grammar school with academy status situated in the centre of Sittingbourne, Kent, England, which educates students aged 11–18.  Whilst the school mainly admits boys, a small number girls have been educated at the school within the Sixth Form.  The school holds specialist status in Sports.  The school has a Latin motto, "nitere porro" which translates as "to strive forward".

Bourne Grammar School: Bourne Grammar School is a co-educational grammar school with academy status on South Road (A15), in Bourne, Lincolnshire, England.  The school was founded in 1330.  It previously held Arts College Status, and was awarded Academy status in January 2012, although it retains its former name.

Spalding Grammar School: Spalding Grammar School (SGS), fully known as The Queen Elizabeth Royal Free Grammar School Spalding, is a boys' grammar school located on "Priory Road" in Spalding, Lincolnshire, England, for pupils aged 11 to 18.  In December 2011, the school was granted an "Outstanding" rating from Ofsted.  The school converted to academy status on 1 February 2013.

Supporting paragraphs: Michael Handley Spalding Grammar School
Answer: 1 February 2013