Time Add/Subtract Calculator
Add or subtract time from any date to find past or future dates.
Time to Add/Subtract
Result Date
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Day of Week
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Days from Today
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Week Number
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Calculation Summary
Start Date
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Operation
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Total Days Added/Removed
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Quick Calculations
30 days from start
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90 days from start
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6 months from start
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1 year from start
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Date Calculation Tips
Common Uses:
- Calculate deadlines and due dates
- Find warranty expiration dates
- Plan events and appointments
- Calculate age at a future date
- Project timelines and milestones
How Months Work:
- Adding 1 month keeps the same day number when possible
- If the day doesn't exist (e.g., Jan 31 + 1 month), it rolls to the last valid day
- Months vary in length (28-31 days)
Quick Reference:
- 1 week = 7 days
- 2 weeks = 14 days
- 30 days ≈ 1 month
- 90 days ≈ 3 months (1 quarter)
- 365 days = 1 year