datetime/isworkingday
isworkingday (Is Working Day – Weekend and Public Holiday Check) is a 1001fx API function in the group Date & time: POST https://api.1001fx.com/datetime/isworkingday, 1 credit per call. It works as a ready-made module in Make or as a plain HTTP call.
Checks whether a date is a working day: not on the weekend and not a public holiday of the country (and state). Returns the holiday name and the next and previous working day.
https://api.1001fx.com/datetime/isworkingdayX-API-KEY: YOURSECRETAPIKEY How toapplication/jsondatestringrequirede.g. 2026-12-25 or 25.12.2026.
countrystringoptionalISO code for public holidays, e.g. DE (default), AT, CH, US.
statestringoptionalOptional state/region code, e.g. BY for Bavaria.
weekendarray<number>optionalISO weekdays that are not working days (1 = Monday … 7 = Sunday). Default [6, 7].
Is Working Day – Weekend and Public Holiday Check
Input
{
"date": "2026-12-25",
"country": "DE",
"state": "BY"
}Output · HTTP 200
{
"statusCode": 200
}curl -X POST 'https://api.1001fx.com/datetime/isworkingday' \
-H 'X-API-KEY: YOURSECRETAPIKEY' \
-H 'Content-Type: application/json' \
-d '{"date":"2026-12-25","country":"DE","state":"BY"}'Run it in your browser or create a free account and get 100 credits every month.