How To Calculate Years And Months In Excel From Today

Excel Date Calculator: Years & Months From Today

Calculate the exact years and months between today and any future or past date in Excel. Get step-by-step formulas and visual breakdowns.

Complete Guide: How to Calculate Years and Months in Excel From Today

Calculating the difference between dates in years and months is a common requirement in financial modeling, project management, and HR applications. While Excel doesn’t have a single built-in function for this exact calculation, you can achieve accurate results using a combination of functions. This comprehensive guide covers all methods with practical examples.

Key Insight

The DATEDIF function is Excel’s hidden gem for date calculations, though it’s not documented in newer versions. It remains fully functional and is the most efficient method for years/months calculations.

Method 1: Using DATEDIF Function (Most Accurate)

The DATEDIF function calculates the difference between two dates in years, months, or days. For years and months calculation:

  1. Enter your start date in cell A1 (e.g., =TODAY() for current date)
  2. Enter your end date in cell B1
  3. For complete years: =DATEDIF(A1,B1,"y")
  4. For remaining months: =DATEDIF(A1,B1,"ym")
  5. Combine with: =DATEDIF(A1,B1,"y") & " years " & DATEDIF(A1,B1,"ym") & " months"
Function Syntax Unit Example Output Description
DATEDIF(start,end,"y") Years 5 Complete years between dates
DATEDIF(start,end,"m") Months 65 Complete months between dates
DATEDIF(start,end,"ym") Months 3 Remaining months after complete years
DATEDIF(start,end,"md") Days 15 Remaining days after complete months

Method 2: Using YEARFRAC and MONTH Functions

For more complex calculations or when you need decimal years:

  1. Years with decimals: =YEARFRAC(A1,B1,1)
  2. Total months: =DATEDIF(A1,B1,"m")
  3. Combined text: =INT(YEARFRAC(A1,B1)) & " years " & MOD(DATEDIF(A1,B1,"m"),12) & " months"

Basis parameter in YEARFRAC:

  • 0 or omitted: US (NASD) 30/360
  • 1: Actual/actual
  • 2: Actual/360
  • 3: Actual/365
  • 4: European 30/360

Method 3: Using EDATE Function for Future/Past Dates

The EDATE function helps calculate dates by adding months:

  1. Date 6 months from now: =EDATE(TODAY(),6)
  2. Date 2 years and 3 months ago: =EDATE(TODAY(),-27)
  3. Combine with DATEDIF for precise calculations

Common Errors and Solutions

Error Cause Solution
#NUM! End date before start date Swap date order or use ABS function
#VALUE! Non-date value entered Ensure cells contain valid dates
Incorrect month count Using wrong DATEDIF unit Use “ym” for remaining months after years
Leap year miscalculations Default 30-day months Use basis=1 in YEARFRAC for actual days

Advanced Techniques

1. Dynamic Age Calculation:

=IF(DATEDIF(A1,TODAY(),"y")>0,DATEDIF(A1,TODAY(),"y") & " years " & DATEDIF(A1,TODAY(),"ym") & " months","Less than 1 year")

2. Date Difference with Conditional Formatting:

  1. Select your date cells
  2. Go to Home > Conditional Formatting > New Rule
  3. Use formula: =DATEDIF(TODAY(),A1,"d")<30 for dates within 30 days
  4. Set your preferred formatting

3. Array Formula for Multiple Dates:

{=TEXT(DATEDIF(TODAY(),A1:A10,"y"),"0") & "y " & TEXT(DATEDIF(TODAY(),A1:A10,"ym"),"0") & "m"}

Note: Enter with Ctrl+Shift+Enter in older Excel versions

Real-World Applications

These date calculations have practical applications across industries:

  • Human Resources: Calculating employee tenure for benefits eligibility (e.g., "Employees with ≥5 years service get additional vacation days")
  • Finance: Determining loan durations or investment periods (e.g., "This 30-year mortgage has 25 years 4 months remaining")
  • Project Management: Tracking project timelines against baselines (e.g., "Project is 1 year 2 months behind schedule")
  • Education: Calculating time since degree completion for alumni records
  • Legal: Determining statute of limitations periods

Excel Version Comparisons

Feature Excel 365/2021 Excel 2019 Excel 2016 Excel 2013
DATEDIF function ✓ Fully supported ✓ Fully supported ✓ Fully supported ✓ Fully supported
Dynamic array support ✓ Native support ✗ Requires workarounds ✗ Requires workarounds ✗ Requires workarounds
YEARFRAC basis options ✓ All 5 options ✓ All 5 options ✓ All 5 options ✓ All 5 options
EDATE function ✓ Fully supported ✓ Fully supported ✓ Fully supported ✓ Fully supported
LET function for complex calculations ✓ Native support ✗ Not available ✗ Not available ✗ Not available
Spill range operator (#) ✓ Native support ✗ Not available ✗ Not available ✗ Not available

Best Practices for Date Calculations

  1. Always use cell references: Avoid hardcoding dates in formulas for maintainability
  2. Validate date entries: Use Data Validation to ensure proper date formats
  3. Document your formulas: Add comments explaining complex date calculations
  4. Consider time zones: For international applications, standardize on UTC or include timezone offsets
  5. Test edge cases: Verify calculations with:
    • Leap days (February 29)
    • Month-end dates (January 31 to February 28)
    • Negative date differences
    • Very large date ranges (>100 years)
  6. Use helper columns: Break complex calculations into intermediate steps for clarity
  7. Format consistently: Apply uniform date formats across your workbook

Alternative Approaches

Power Query Method:

  1. Load your data into Power Query Editor
  2. Select your date column > Add Column > Date > Age
  3. This creates a duration column you can then break into years/months
  4. Use custom columns with formulas like: 
    Number.From([Duration])/365 for years
Number.Mod(Number.From([Duration]),365)/30 for months

VBA User-Defined Function:

Function YearsMonths(start_date As Date, end_date As Date) As String
    Dim years As Integer, months As Integer, days As Integer
    years = DateDiff("yyyy", start_date, end_date)
    months = DateDiff("m", DateSerial(Year(start_date), Month(start_date) + years, Day(start_date)), end_date)
    YearsMonths = years & " years " & months & " months"
End Function

Use in worksheet as: =YearsMonths(A1,B1)

Performance Considerations

For workbooks with thousands of date calculations:

  • Volatile functions: TODAY() and NOW() recalculate with every change. Minimize their use in large models.
  • Array formulas: Can significantly slow down performance in older Excel versions. Consider converting to values when possible.
  • Calculation mode: Set to Manual (Formulas > Calculation Options) during development of complex models.
  • Helper tables: Pre-calculate common date differences in a separate table rather than repeating calculations.
  • Power Pivot: For very large datasets, consider using DAX measures in the Data Model for better performance.

Frequently Asked Questions

Why does DATEDIF give different results than manual calculation?

DATEDIF uses banker's logic where:

  • A full year is counted only when the day-of-month in the end date ≥ day-of-month in start date
  • Example: From Jan 31 to Feb 1 is considered 1 month (even though it's only 1 day)
  • For exact day counts, use DATEDIF(start,end,"d") and convert to years manually

How to handle negative date differences?

Use the ABS function to always get positive values:

=DATEDIF(A1,B1,"y") & " years " & DATEDIF(A1,B1,"ym") & " months"
→ becomes:
=DATEDIF(MIN(A1,B1),MAX(A1,B1),"y") & " years " & DATEDIF(MIN(A1,B1),MAX(A1,B1),"ym") & " months"

Can I calculate business years (fiscal years)?

Yes, adjust your formulas based on fiscal year start:

=DATEDIF(A1,B1,"y") + (MONTH(B1)>=7)-(MONTH(A1)>=7)
/* Assumes July 1 fiscal year start */

How to display results in mm/yyyy format?

Combine TEXT functions:

=DATEDIF(A1,B1,"y") & "/" & TEXT(DATEDIF(A1,B1,"ym"),"00")
/* Returns "5/03" for 5 years 3 months */

Authoritative Resources

For official documentation and advanced techniques:

Pro Tip

Create a named range for =TODAY() (e.g., "CurrentDate") to make your formulas more readable and easier to maintain across multiple worksheets.

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