Planning

Availability & Working Days

Use this calendar to plan your NBTC certification timeline. Zergo office closures and NBTC non-working days both affect when you can expect responses and when certification clocks pause.

Zergo Availability

Zergo observes all Thai public holidays plus the additional days marked below. Outside these dates, our team is available Monday–Friday.

Office Hours

Monday–Friday, 08:00–17:00 ICT (UTC+7)

Response Time

Same day or next working day

Extra Days Off

Bridge days beyond Thai public holidays — see amber dates on calendar

12345678910111213141516171819202122232425262728293031
12345678910111213141516171819202122232425262728
12345678910111213141516171819202122232425262728293031
123456789101112131415161718192021222324252627282930
12345678910111213141516171819202122232425262728293031
123456789101112131415161718192021222324252627282930
12345678910111213141516171819202122232425262728293031
12345678910111213141516171819202122232425262728293031
123456789101112131415161718192021222324252627282930
12345678910111213141516171819202122232425262728293031
123456789101112131415161718192021222324252627282930
12345678910111213141516171819202122232425262728293031
NBTC holiday — certification timeline paused; Zergo closed
Zergo additional day off — NBTC processes normally
Weekend

NBTC Working Days

NBTC certification processing times are quoted in working days. Public holidays are excluded from this count — a 30-working-day timeline can span significantly more calendar days if it crosses a holiday cluster.

2026 public holidays affecting NBTC certification timelines
DateHolidayAffects
Thu 1 JanNew Year's DayNBTC + Zergo
Fri 20 FebMakha Bucha Day · † lunar calendarNBTC + Zergo
Mon 6 AprChakri Memorial DayNBTC + Zergo
Mon 13 AprSongkran FestivalNBTC + Zergo
Tue 14 AprSongkran FestivalNBTC + Zergo
Wed 15 AprSongkran FestivalNBTC + Zergo
Fri 1 MayNational Labour DayNBTC + Zergo
Tue 5 MayCoronation DayNBTC + Zergo
Fri 22 MayVisakha Bucha Day · † lunar calendarNBTC + Zergo
Wed 3 JunQueen Suthida's BirthdayNBTC + Zergo
Mon 20 JulAsahna Bucha Day · † lunar calendarNBTC + Zergo
Tue 21 JulBuddhist Lent Day · † lunar calendarNBTC + Zergo
Tue 28 JulKing Vajiralongkorn's BirthdayNBTC + Zergo
Wed 12 AugQueen Sirikit's Birthday / Mother's DayNBTC + Zergo
Tue 13 OctPassing of King BhumibolNBTC + Zergo
Fri 23 OctChulalongkorn DayNBTC + Zergo
Mon 7 DecKing Bhumibol's Birthday (Compensatory) · Dec 5 = SatNBTC + Zergo
Thu 10 DecConstitution DayNBTC + Zergo
Thu 31 DecNew Year's EveNBTC + Zergo
Wed 30 DecZergo Additional Day OffZergo only

† Buddhist calendar holidays (Makha Bucha, Visakha Bucha, Asahna Bucha, Buddhist Lent) are set by the Thai lunar calendar. 2027 dates shown are estimates — verify against official Thai government announcements closer to the date.

Compensatory holidays are announced by the Thai cabinet on an annual basis and may differ from the dates shown. Confirm before scheduling certification milestones.

Ready to plan your submission?

Contact Zergo to confirm your timeline, or review the full certification process to understand each step.

Contact ZergoCertification Process