Table of Contents:
Customer support during on-call hours and holidays
Appian Professional or Signature, legacy Advanced, Enterprise, Premier and Premier Plus customers are entitled to 24x7 support for production issues (P1 and P2 cases only). This means that these customers will be supported over the weekends and bank holidays by on-call engineers.
Below are the required steps Advanced or Enterprise, legacy Premier and Premier Plus customers must take to get support from on-call engineers:
On-call hours within each region
Holiday dates within each region
Below is a list of all holidays in various regions for the remainder of 2025 and 2026. A number of these holidays now include blackout dates. See Blackout Periods further down this KB article for details of dates and restricted activities.
Region
Holiday
Date
USA
Thanksgiving (2 days)
Thursday 27th & Friday 28th November 2025
Christmas (2 days)
Wednesday 24th & Thursday 25th December 2025
New Year’s Day
Thursday 1st January 2026
Memorial Day
Monday 25th May 2026
Independence Day
Saturday 4th July 2026
Labor Day
Monday 7th September 2026
Thursday 26th & Friday 27th November 2026
Friday 25th & Saturday 26th December 2026
Friday 1st January 2027
UK (EMEA)
Christmas (2 Days)
Thursday 25th and Friday 26th December 2025
New Year's Day
Good Friday
Friday 3rd April 2026
Easter Monday
Monday 6th April 2026
Early May UK Bank Holiday
Monday 4th May 2026
Spring UK Bank Holiday
Summer UK Bank Holiday
Monday 31st August 2026
Sydney (APJ)
Labour Day
Monday 6th October 2025
Australia Day
Monday 26th January 2026
Anzac Day
Saturday 25th April 2026
King's Birthday (NSW)
Monday 8th June 2026
Wednesday 7th October 2026
Wednesday 25th & Thursday 26th December 2026
Blackout Periods
During Blackout Dates, Appian Solution Engineering will not permit or carry out any of the following activities:
These dates apply globally, even if the holiday only takes place in a single region:
Blackout Start Date*
Blackout End Date**
Wednesday 26th November 2025
Monday 1st December 2025
Friday 19th December 2025
Wednesday 3rd January 2026
Thursday 27th March 2026
Monday 1st April 2026
Friday 22nd May 2026
Friday 3rd July 2026
Monday 6th July 2026
Friday 4th September 2026
Tuesday 8th September 2026
Wednesday 25th November 2026
Monday 30th November 2026
Friday 18th December 2026
Monday 4th January 2027
* Maintenance Windows or Upgrades cannot be scheduled after 4:00 PM EST / EDT on the Blackout Start Date
** Maintenance Windows or Upgrades can be scheduled after 10:00 PM EST / EDT on the Blackout End Date
This article applies to all versions of Appian Cloud.
Last Reviewed: October 2025