Calculator for days between dates

How dem dey count days

Di calculator dey count how many calendar days dey between start date and end date, e go count start date, but e no go count end date. Na standard way — same way you dey count hotel stay nights or project duration.

Business days no include Saturday and Sunday. Dem no dey remove public holidays, because holidays dey different for each country and region. If you need remove certain holidays, you go subtract dem yourself from di business days count.

Common uses

• Calculate contract or project duration
• Know how many days remain to deadline, event, or holiday
• Count business days for payment terms like net-30 or net-60
• Calculate notice periods for work or rent/lease
• Know how many days don pass since one event

Inclusive vs exclusive counting

Di “start inclusive, end exclusive” style (people dey call am half-open interval too) na di most common for everyday life and for programming. Under this convention:

• Hotel stay wey you check in March 1 and check out March 4 na 3 nights (March 1, 2, 3)
• Project wey run from Monday to Friday na 5 days
• 30-day trial wey start January 1 go expire January 31 (day 30 na January 30, di last full day)

Some legal matter fit use fully inclusive counting (both start and end dates count), wey go add one extra day. If law talk say appeal must happen within 30 days of decision wey date January 1, and both decision date and filing date count, di deadline na January 30, no be January 31. If matter get legal precision, always verify which counting rule dem dey use.

Convert days go other units

Di month and year conversions na approximate because months no get same length and years dey change for leap year. If you need exact month or year count, use age or date-difference calculators wey dey do calendar-aware arithmetic instead of dividing by average.

Business days for real life

One calendar month get about 20 to 23 business days, depending on how weekends fall. One year get 260 to 262 business days (52 weeks × 5 days, ±1 or 2 depending on where January 1 fall). These numbers no include public holidays, wey fit reduce am by 8 to 12 days for most countries.

For payment terms: net-30 for most business contexts mean 30 calendar days, no be 30 business days. Net-30 business days go be about 6 weeks. Always check whether payment term talk calendar days or business days, because di difference fit affect cash flow well.

For employment notice periods: 2-week notice period normally mean 14 calendar days for most places, no be 10 business days — but e fit vary by country and contract. For some countries, legal notice periods fit be in working days, and you need local public holiday schedule to calculate am well.

Practical examples

Project deadlines

Project wey start April 7 with 90-day duration go end July 6. If contract talk 3 months instead, e go end July 7 — one day later, because dem use months instead of raw day count.

Payment terms

Invoice wey date March 15 with net-30 go due April 14. Invoice wey date March 1 with net-30 go due March 31. Due date dey shift for every invoice date, so calculator dey more reliable pass mental calculation for accounts payable management.

Lease and tenancy

12-month lease wey start September 1 go end August 31 for next year — no be September 1. Tenant get right to stay till August 31, wey be 365 days (or 366 for leap year). Lease wey end September 1 by convention go be 13-month lease.

Age of events and records

If you know di number of days since one historical event, company founding, or start of conflict, e give you precise measure wey avoid ambiguity about partial years. Di days-between calculator go give you this as integer straight.