5 Best APIs for Scheduling in Nigeria

Holidays API by Holidays API (holidaysapi.com) is a comprehensive public holiday data service providing programmatic access to historical and upcoming public holidays for over 200 countries and territories, covering national holidays, regional observances, and religious celebrations from 2015 onward. For Nigerian developers building scheduling applications, payroll systems, HR software, or any calendar-aware tool, the Holidays API provides structured holiday data for Nigeria's statutory public holidays alongside comprehensive global coverage — enabling applications that must handle public holidays across multiple countries. Nigeria's public holidays covered by the Holidays API include the 12 statutory national holidays recognized by the Federal Government: New Year's Day (January 1), Democracy Day (June 12), Independence Day (October 1), Christmas Day (December 25), Boxing Day (December 26), Good Friday, Easter Monday, Eid al-Fitr (2 days), Eid al-Adha (1 day), Id el Maulud (Mawlid an-Nabi), and Workers Day (May 1). The moveable holidays — Easter and the Islamic observances — are calculated per year based on the lunar calendar, and Holidays API provides the correct dates for each year in its database. Payroll automation using the Holidays API is one of the most direct use cases for Nigerian businesses. Payroll software must correctly identify which days in a given month are working days versus public holidays to calculate statutory pay, overtime rates, and payment run timing. By querying the Holidays API at the start of each year, Nigerian payroll systems can populate their holiday calendars with accurate dates for all 12 national holidays — including the exact dates for Easter and Islamic holidays — without manual data entry that risks errors. HR leave management systems benefit from accurate public holiday data for calculating available leave days, processing leave applications that overlap with public holidays, and ensuring statutory holidays are correctly excluded from annual leave counts. Nigerian HR platforms serving companies across multiple states should note that some Nigerian states observe additional state-level public holidays beyond the national list — though the Holidays API covers national holidays primarily. Multi-country scheduling for Nigerian businesses with international operations is streamlined by Holidays API's 200+ country coverage. A Nigerian company scheduling meetings with partners in the US, UK, and Germany can query all three countries' holiday calendars simultaneously to identify dates when all parties are working — avoiding the manual research of each country's public holiday schedule that is otherwise required. Content calendar planning for Nigerian digital agencies and marketing teams uses public holiday data to identify themed content opportunities. Nigerian national holidays like Independence Day on October 1 or Democracy Day on June 12 are high-engagement content moments that Nigerian brands reliably target with special campaigns, social media posts, and promotional offers. Automated content calendar tools can pull Holidays API data to pre-populate the editorial calendar with upcoming public holidays as content planning reminders. The Holidays API operates on a freemium model with a free tier providing access to historical holiday data from 2015 through the previous year. Accessing current year or future year holidays requires a paid subscription starting at around $19/year — making it one of the most affordable commercial holiday APIs available for Nigerian app developers. The Holidays API historical data archive from 2015 makes it one of the longest-available datasets for auditing past payroll or scheduling decisions against actual Nigerian public holiday dates.

Timeanddate Public Holidays API provides access to the comprehensive public holiday and observance database maintained by timeanddate.com — one of the world's most trusted sources for time zone, calendar, and astronomical data, operating since 1995. The Timeanddate holidays dataset covers over 230 countries and territories with exceptional accuracy, including Nigeria's national public holidays with correct dates for moveable feasts like Easter and Islamic holidays calculated for each year. For Nigerian businesses and developers who need authoritative, accurate holiday data backed by decades of calendar expertise, Timeanddate is one of the most reliable sources available. The Timeanddate holiday API returns structured data for each public holiday: the holiday name, date, type (national, observance, religious), and description. For Nigerian holidays, this includes the statutory national holidays plus major religious observances: New Year's Day, Workers Day (May 1), Democracy Day (June 12), Independence Day (October 1), Christmas Day, Boxing Day, Good Friday, Easter Monday, Eid al-Fitr, Eid al-Adha, and Mawlid al-Nabi. The religious holidays are returned with the year-specific dates computed by Timeanddate's calendar calculation system, which has a long track record of accuracy. Business day calculation using Timeanddate holiday data is a critical function for Nigerian financial services and legal technology. Loan processing timelines specified in "business days," contract cooling-off periods, regulatory filing deadlines, and legal notice periods all require accurate knowledge of which days are public holidays in Nigeria. A fintech platform promising a 3-business-day loan disbursement needs to correctly skip public holidays in that calculation — using Timeanddate's authoritative holiday data ensures the calculation is defensible and accurate. International scheduling across time zones and holiday calendars is a strength of Timeanddate's integrated platform. The Timeanddate API includes both time zone and holiday data, enabling Nigerian companies coordinating with international counterparts to check simultaneously whether a proposed meeting date conflicts with any party's public holiday, and to convert the proposed time to each party's local time zone. For Nigerian professional services firms, consulting companies, and tech companies with international clients, this integrated time zone and holiday functionality simplifies scheduling workflows. Sun and moon calculations from Timeanddate (available in related API products) include sunrise, sunset, moonrise, moonset, and moon phase data — useful for Nigerian agricultural apps planning outdoor activities around daylight hours, Nigerian security platforms scheduling outdoor operations, and Nigerian event planners arranging outdoor events around natural light. The Timeanddate API is commercially licensed through a subscription model, with pricing that reflects the premium quality and reliability of the underlying data. For Nigerian businesses building compliance-sensitive applications where incorrect holiday dates could cause regulatory violations, missed deadlines, or customer complaints, the Timeanddate commercial license with its data accuracy guarantee is worth the investment. API access uses standard REST calls with API key authentication, returning JSON responses. The Timeanddate developer documentation is comprehensive, covering all endpoint parameters, response formats, and country codes. Nigerian developers integrating Timeanddate holiday data can expect well-maintained documentation and a stable API suitable for production use in business-critical scheduling applications.

HelloDuty is a workforce management and duty scheduling API platform enabling businesses to manage employee schedules, shift assignments, and workforce allocation. The HelloDuty API provides endpoints for shift creation, employee scheduling, duty roster management, and real-time workforce coordination. Nigerian businesses, retail chains, hospitality companies, and service providers use HelloDuty API to automate shift scheduling, manage employee duties, coordinate workforces, and optimize labor allocation across multiple locations.