Date Calculator

⚠️

Days Between Two Dates

Start Date

End Date

Include end day (add 1 day to result)

Count business days only (exclude weekends)

Exclude US federal holidays from business days

SELECT HOLIDAYS TO EXCLUDE:

Total Duration

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days between dates

Date Timeline

Start Date

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End Date
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Years

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Months

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Weeks

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Total Days

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Weekdays

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Weekends

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Hours

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Minutes

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⚠️

Add or Subtract from a Date

Start Date

Add or Subtract

Duration to Add / Subtract

Years

Months

Weeks

Days

Repeat Calculation

times (shows multiple results, max 20)

Calculate in business days only (exclude weekends)

Exclude US federal holidays from business days

SELECT HOLIDAYS TO EXCLUDE:

Result Date

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Date Timeline

Start Date

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Result Date
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📅 Result Summary

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⚠️

What Day of the Week Is This Date?

Select a Date

Works for any date — past, present, or future

Monday

Full Date

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Day of Year

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Week Number

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Days Until Year End

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📅 Date Info

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⚠️

Week Number Calculator

Select a Date

Find the ISO week number for any date

Week Number

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of —

— to —

Start of Week

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End of Week

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Day of Year

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Weeks in Year

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ℹ️ ISO Week Standard

This uses the ISO 8601 standard. Weeks start on Monday. Week 1 is the week containing the first Thursday of the year. Some years have 53 weeks.