Working Days Calculator
Compute working days between two dates, excluding weekends + selected country's public holidays. Built-in gazetted holidays for Singapore and Malaysia (2025-2027) and the Philippines, Indonesia, Thailand and Vietnam (2025-2026).
Working Days Calculator
How to use the Working Days Calculator
Pick your start + end dates
Both dates included in the count. Default: today + 30 days. Useful for: project SLAs, contract delivery dates, employment notice periods, banking processing time, government deadlines.
Choose the country
Built-in gazetted public holiday data: Singapore and Malaysia for 2025-2027, the Philippines, Indonesia, Thailand and Vietnam for 2025-2026. Pick "None" if you only want to exclude weekends without any holiday adjustment. State/regional holidays (e.g., specific Malaysian state holidays) NOT included — only national. For Malaysia that means the federal list, New Year's Day and the replacement day owed when a holiday falls on a Sunday, for the states with a Saturday-Sunday weekend.
Read the working day count
Headline = working days in your range (excluding weekends + holidays in the selected country). The breakdown shows total calendar days, weekends excluded, holidays excluded, and the final working day count. Each holiday is listed individually for verification.
Use for SLA + project planning
"5 working days" promises depend on the country's holiday calendar. A 5-working-day SLA spanning Singapore's CNY week becomes ~10 calendar days. Always specify which country's working-day calendar applies in cross-border SLAs or expect disputes.
Working days — the calendar math that drives real-world deadlines
Most business deadlines, legal SLAs, and contractual durations are measured in "working days" — not calendar days. A 5-working-day delivery promise from Singapore made on Friday of Chinese New Year week could be 14+ calendar days due to weekends + public holidays. Without holiday-aware working-day math, project schedules slip + customers get false promises. This calculator handles the math for ASEAN markets with built-in gazetted holiday data for six countries (Singapore and Malaysia through 2027) — letting you plan accurately across borders.
Why working days vary so much across ASEAN
ASEAN holiday calendars are diverse and complex. Singapore: ~11 national public holidays/year, primarily religious (CNY, Hari Raya, Deepavali, Christmas, Vesak, Hari Raya Haji) + civic (National Day, Labour Day). Malaysia: ~13-15 national, plus state-level additions. Federal includes Hari Raya (2 days), Merdeka Day, Malaysia Day, religious days. Philippines: ~12 regular + special non-working holidays. Notable: extensive Holy Week observance, Bonifacio Day, Rizal Day. Indonesia: ~16 national, heaviest on Islamic holidays (Idul Fitri, Idul Adha) + Christian (Christmas, Good Friday) + Hindu/Buddhist (Nyepi, Waisak) + civic (Independence Day, Pancasila Day). Thailand: ~17 national, including King's + Queen's birthdays, Songkran (3-day water festival), Buddhist days. Vietnam: ~9 national but Tet (Lunar New Year) spans 5 days. Practical implication: an SLA that means "5 working days" in Singapore can mean very different actual durations in different ASEAN markets due to varying holiday density.
A "5 working day SLA" in Singapore during Chinese New Year week is ~14 calendar days; the same in Thailand during Songkran (April 13-15) is ~10 calendar days. Same SLA, very different real-world wait.
The lunar holiday problem
Several major ASEAN holidays follow lunar or Islamic calendars, not the Gregorian calendar — meaning their dates SHIFT each year. Chinese New Year: lunar; ranges from late January to mid-February. 2025: Jan 29-30; 2026: Feb 17-18; 2027: Feb 6-7. Hari Raya Puasa (Eid al-Fitr): Islamic lunar; shifts ~11 days earlier each year. 2025: March 31; 2026: March 21; 2027: March 10. Hari Raya Haji (Eid al-Adha): Islamic lunar. 2025: June 7; 2026: May 27; 2027: May 17. Vesak / Wesak / Waisak: Buddhist lunar; May full moon. Deepavali / Diwali: Hindu lunar; October/November. Tet: Vietnamese lunar; same dates as Chinese New Year usually. For later years: holiday dates are added as each government publishes its list — Singapore's Ministry of Manpower and Malaysia's Prime Minister's Department both publish the following year by August. This tool covers Singapore and Malaysia through 2027 and the other four countries through 2026; a range beyond that warns you that its holidays are missing.
Practical SLA + contract drafting
Cross-border business across ASEAN markets requires explicit working-day handling in contracts. Best practices: (1) Specify the country's working-day calendar applying to the SLA — "5 Singapore working days" is unambiguous; "5 working days" is not. (2) Use calendar days for cross-border services where the customer's working calendar differs from the provider's — easier to manage. (3) Add buffer time around major regional holidays — CNY week, Hari Raya week, Songkran, Tet all create extended slowdowns. (4) For payment terms: "Net 30 calendar days" is clearer than "Net 30 working days" given regional holiday variation. (5) For court + government deadlines: always use the local working-day calendar — court working days exclude national holidays + sometimes additional court-specific days.
Public holidays by country, lunar dates that shift, and what five working days means at CNY
Working days = business days minus public holidays. Critical for SLA + contract math.
Singapore: 11 public holidays/year. Malaysia + Indonesia + Thailand: 13-17. Vietnam: 11 paid days under Labour Code Article 112, five of them Tet.
Lunar holidays (CNY, Hari Raya, Vesak, Deepavali, Tet) shift dates each year — recalc annually.
Hari Raya Puasa follows Islamic lunar calendar — shifts ~11 days earlier each Gregorian year.
"5 working days" in Singapore during CNY week = ~14 calendar days. Plan SLAs around major holiday periods.
Cross-border SLAs need explicit country specification: "5 Singapore working days" not "5 working days."
Thai Songkran festival (April 13-15) creates a major 3-day national shutdown.
Vietnamese Tet (Lunar New Year, ~5 days) effectively shuts down Vietnam for 1-2 weeks of reduced productivity.
State-level holidays (e.g., specific Malaysian state holidays) NOT in this tool — only national.
Calendar days = include weekends + holidays. Working days = exclude both. Always specify which in contracts.
Frequently Asked Questions
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They are the gazetted public holidays from each country's official source — the Ministry of Manpower for Singapore, the Prime Minister's Department (BKPP) for Malaysia, the Official Gazette for the Philippines, and so on — for 2025-2027 in Singapore and Malaysia and 2025-2026 elsewhere. Holidays that follow lunar or Islamic calendars can still move by a day, and governments sometimes declare an extra holiday at short notice (Malaysia announced its 20 March 2026 holiday five days before it), so cross-check anything binding against the official list.
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Complexity. Malaysia has 13 states + federal territories, each with its own holiday calendar additions (Sultan's birthdays, state foundation days). Indonesia has 38 provinces with regional variations. Including state holidays would require 50+ separate lookup tables and significant maintenance overhead. For state-specific calculations: check the relevant state government website + manually subtract state-specific days from this tool's result.
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This tool counts the holiday once — if the date IS a Sunday, it's counted as a weekend day (not double-counted as both weekend + holiday). "Observed" handling: in Singapore + several ASEAN markets, if a public holiday falls on a Sunday, the following Monday is the "observed" public holiday. This tool includes both the original date + the official observed date when announced (e.g., 2026 SG National Day Aug 9 falls on Sunday — observed Monday Aug 10 included).
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Not in this version — country selection drives all holidays. Workaround for company holidays (year-end shutdowns, annual leave days): manually subtract them from the working day count this tool gives. Workaround for state holidays: same — manually subtract state-specific days. For a fully custom holiday calendar tool, business calendar apps (Google Calendar with custom event calendars, Notion calendar views) work better.
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Best practice: "X working days, exclusive of [country]'s public holidays." Ambiguous: "5 working days" alone. For cross-border: specify whose working calendar applies. "5 Singapore working days from Provider receipt" is clear; "5 working days" leads to dispute. Common SLA language: "Response within 5 [country] working days, excluding [country] public holidays." Always specify country explicitly.
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Used somewhat interchangeably, but technically: Business days = Mon-Fri only (excludes weekends only). Working days = business days minus public holidays. Common usage: "business days" often implies the broader holiday-aware count anyway. For precision in legal documents, use "working days exclusive of public holidays" to remove ambiguity.
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Islamic months begin with the sighting of the new crescent moon, which varies slightly by location due to atmospheric conditions + observer position. Most countries use astronomical calculation + religious authority confirmation. Singapore + Malaysia typically align (both observe same dates); Indonesia sometimes diverges by 1 day; Brunei often aligns with Singapore/Malaysia. Implication: cross-country business spanning Hari Raya often has 1-2 day discrepancies in observed dates. Check each country's gazette for exact dates.
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Singapore and Malaysia are covered through 2027: the Ministry of Manpower published Singapore's 2027 holidays in June 2026 and Malaysia's Prime Minister's Department its federal table in August 2026. The Philippines, Indonesia, Thailand and Vietnam are covered through 2026. For a range past a country's coverage the tool still counts, excludes weekends only for the uncovered days, and says so above the result, because that count is an over-estimate.
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No. All calculations run in your browser via JavaScript. Open DevTools → Network and confirm zero outbound requests. Dates stay on your device. Safe for confidential project + contract calculations.
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Pair with: Date Difference Calculator for calendar-day math; Date Add/Subtract Calculator for date arithmetic; Week Number Calculator for ISO week numbers; Time Duration Calculator for hour/minute math; Timezone Converter for cross-region scheduling. External: each country's official gazette for authoritative holiday lists; Bloomberg + Reuters business-day calendars for finance contexts.
Method & sources
How it computes
Working days = calendar days in the range, less Saturdays and Sundays, less the gazetted public holidays of the selected country that fall on a weekday. National holidays only; state and regional holidays are not counted.
What this tool implements
- Singapore: 11 gazetted public holiday days a year, from ten named holidays — Chinese New Year spans two (Ministry of Manpower).
- Viet Nam: 11 paid public holiday days under Labour Code Article 112 — 1 New Year, 5 Lunar New Year, 1 Victory Day, 1 International Labour Day, 2 National Day, 1 Hung Kings Commemoration Day.
- Lunar and Islamic holidays move against the Gregorian calendar each year, so the tables are per-year rather than computed.
Sources
- Ministry of Manpower, Singapore. Public holidays. https://www.mom.gov.sg/employment-practices/public-holidays
- Socialist Republic of Viet Nam. Labour Code No. 45/2019/QH14, Article 112 (ILO NATLEX). https://natlex.ilo.org/dyn/natlex2/natlex2/files/download/110469/…
What can make this go out of date
- Per-country gazetted public holiday tables, maintained per calendar year
Pick up where you left off
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