Calculate Days Between Two Dates In Excel 2013

Precisely calculate days between two dates in Excel 2013 with our interactive tool. Includes workdays, weekends, and custom date range analysis.

Complete Guide: Calculate Days Between Two Dates in Excel 2013

Master Excel 2013’s date functions to calculate precise time intervals between dates, including workdays, weekends, and custom date exclusions.

Pro Tip:

Excel stores dates as sequential numbers (1 = January 1, 1900). This serial number system enables all date calculations in Excel 2013.

1. Basic Date Difference Calculation

The simplest method uses basic subtraction:

=End_Date – Start_Date
=B2-A2

Where:

• A2 contains your start date (e.g., 2023-01-15)
• B2 contains your end date (e.g., 2023-02-20)
• Result shows as a number (36 in this example)

2. Using DATEDIF Function (Most Accurate)

The DATEDIF function provides precise control over date calculations:

=DATEDIF(start_date, end_date, unit)

Unit Argument	Returns	Example Result
“d”	Days between dates	36
“m”	Complete months between dates	1
“y”	Complete years between dates	0
“ym”	Months excluding years	1
“yd”	Days excluding years	36
“md”	Days excluding months and years	5

3. Calculating Workdays Only

For business calculations excluding weekends:

=NETWORKDAYS(start_date, end_date, [holidays])

Example with holidays:

=NETWORKDAYS(A2, B2, D2:D5)

Where D2:D5 contains holiday dates.

Microsoft Official Documentation:

For complete function reference, see Microsoft’s official NETWORKDAYS documentation.

4. Advanced Date Calculations

1. Days excluding specific weekdays:
   =SUMPRODUCT(–(WEEKDAY(ROW(INDIRECT(A2&”:”&B2)))={2,3,4,5,6}))

   This excludes Sundays (1) from the count.

2. Partial year calculations:
   =YEARFRAC(start_date, end_date, [basis])

   Basis options: 0=US(30/360), 1=Actual/actual, 2=Actual/360, 3=Actual/365, 4=European 30/360

3. Date validation:
   =IF(AND(ISNUMBER(A2), ISNUMBER(B2)), DATEDIF(A2,B2,”d”), “Invalid dates”)

5. Common Errors and Solutions

Error Type	Cause	Solution
#VALUE!	Non-date values in cells	Use DATEVALUE() or format cells as dates
#NUM!	Start date after end date	Swap date references or use ABS()
Incorrect count	Time components included	Use INT() to remove time: =INT(B2-A2)
1900 date system	Excel counts from 1/1/1900	Use DATE() for accurate date creation

Excel 2013 vs. Newer Versions: Date Function Comparison

Version Compatibility:

All functions shown work in Excel 2013, but newer versions offer additional date functions like DAYS(), which provides simpler syntax for basic day counting.

Function	Excel 2013	Excel 2016+	Excel 365
DATEDIF	✓ Full support	✓ Full support	✓ Full support
NETWORKDAYS	✓ Full support	✓ Full support	✓ Full support
DAYS	✗ Not available	✓ Available	✓ Available
NETWORKDAYS.INTL	✗ Not available	✓ Available	✓ Available
YEARFRAC precision	Standard calculation	Improved accuracy	Highest precision
Date array handling	Limited to 65,536 cells	Limited to 65,536 cells	Dynamic arrays (unlimited)

Performance Considerations

For large datasets in Excel 2013:

• Avoid volatile functions like TODAY() in calculations
• Use helper columns for complex date operations
• Limit NETWORKDAYS holiday ranges to essential dates only
• Consider using Power Query for datasets over 100,000 rows

Academic Research:

The National Institute of Standards and Technology provides comprehensive guidelines on date calculation standards that align with Excel’s date system implementation.

Practical Applications in Business

1. Project Management

Calculate:

• Project durations excluding weekends
• Milestone deadlines with buffer periods
• Resource allocation timelines

=NETWORKDAYS(ProjectStart, ProjectEnd) – SUM(BufferDays)

2. Financial Calculations

Key applications:

• Loan interest periods: =YEARFRAC(Start,End,1)*365
• Investment holding periods
• Contract duration analysis

3. HR and Payroll

Essential calculations:

1. Employee tenure: =DATEDIF(HireDate,TODAY(),”y”) & ” years, ” & DATEDIF(HireDate,TODAY(),”ym”) & ” months”
2. Vacation accrual periods
3. Probation period tracking

Government Standards:

The IRS publication 538 details accounting periods that align with Excel date calculations for tax purposes.

4. Data Analysis

Advanced techniques:

• Time-series analysis with date groupings
• Cohort analysis by sign-up dates
• Seasonal trend identification

=FLOOR(MONTH(date),3) // Groups dates by quarter