Posted on Sunday 21st Feb 2016
Teachers' unions in England had complained that the timescale would not give schools enough time to prepare.
"It will take time for teachers to understand the detail," said schools minister Nick Gibb in a letter to the National Association of Head Teachers.
Labour said the changes were causing "chaos" in schools.
Since the mid 1990s, the tests, often known as sats, have been taken by primary pupils in England to assess their ability in English and maths.
Until the latest change, this year's deadline for schools to submit assessments by teachers of their pupils' writing tests, would have been four weeks earlier than last year.
Schools were worried the shorter timescale would raise pressure on both staff and pupils as it coincided with higher standards demanded in the tests.
Latest News
15/09/20Heads warn of teacher shortages without Covid tests
Schools in England are being "severely hampered" by delays in Covid tests for teachers, say head teachers.
10/09/201 in 10 pupils not in school, admits PM
Boris Johnson reveals that 89% of pupils have returned to school since classrooms opened for the autumn term
04/09/20The changes to expect at schools in Kent as coronavirus safety measures are introduced
As a raft of new safety measures are in schools, this is what to expect under the 'new normal'.
03/09/20Special school heads think 14% of their children won’t be back
By Amy Skipp September 3, 2020
02/09/20Thousands of new special school places announced
Thousands of new school places will be created for children with special educational needs and disabilities (SEND) with 35 new free special schools, the government has announced.