It has just come to my notice that this year I missed my half millionth Birthhour, which was also my 30 millionth Birthminute. Luckily I still have plenty of time to prepare for my 2 billionth Birthsecond.
To avoid missing these significant occasions download Anniversaries.zip and calculate to the second the exact anniversary from any specified date and time.
Anniversaries - Screen shot
| Latex Maths Text in… on Pint, MPmath and implied units… | |
 | dougaj4 on The VBA Decimal data type |
 | Ludek on The VBA Decimal data type |
| dougaj4 on The VBA Decimal data type |
| Ludek on The VBA Decimal data type |
| dougaj4 on About Newton Excel Bach |
 | Reinaldo Chohfi Jr. on About Newton Excel Bach |
| Solving cubic equati… on Solving Quadratic, Cubic, Quar… | |
 | David N on A Match Function Bug … |
| dougaj4 on A Match Function Bug … |
| SectionProperties up… on SectionProperties update updat… | |
| David N on A Match Function Bug … |
| dougaj4 on Fitting 3D circles to scattere… |
 | Aaron on Fitting 3D circles to scattere… |
| dougaj4 on 3D plots with the latest … |
Newton Excel Bach, not (just) an Excel Blog 
=DateAfter() is new to me (and to excel 2007) I assume it is VBA?
LikeLike
Nick – yes there are two UDFs included in the download; =DateAfter() and =Phi().
Here’s the code:
Function Phi() As Double
Phi = 1.61803398874989
End Function
Function DateAfter(DateFrom As Double, Period As Double, Optional TUnit As String) As Variant
Dim TFactor As Double, Yearinc As Long, Monthinc As Long, Dayinc As Double, YearLength As Long
If IsMissing(TUnit) = True Then
TFactor = 1
Else
TUnit = LCase(TUnit)
Select Case TUnit
Case “seconds”
TFactor = 1# / (24# * 3600#)
Case “minutes”
TFactor = 1 / (24 * 60)
Case “hours”
TFactor = 1 / (24)
Case “days”
TFactor = 1
Case “weeks”
TFactor = 7
Case “months”
TFactor = -1
Case “years”
TFactor = -2
Case Else
DateAfter = “Invalid Time Unit”
Exit Function
End Select
End If
If TFactor = -1 Then
Yearinc = Int(Period / 12)
Monthinc = Int(Period – Yearinc * 12)
Dayinc = (Period – Int(Period)) * 365 / 12
DateAfter = DateSerial(Year(DateFrom) + Yearinc, Month(DateFrom) + Monthinc, (DateFrom – Int(DateFrom)) + Dayinc)
ElseIf TFactor = -2 Then
Yearinc = Int(Period)
DateAfter = DateSerial(Year(DateFrom) + Yearinc, Month(DateFrom), Day(DateFrom))
YearLength = DateSerial(Year(DateFrom) + Yearinc + 1, Month(DateFrom), Day(DateFrom)) – DateAfter
Dayinc = (Period – Int(Period)) * YearLength
DateAfter = DateAfter + Dayinc + (DateFrom – Int(DateFrom))
Else
DateAfter = DateFrom + Period * TFactor
End If
End Function
LikeLike
Pingback: Daily Download 27: Miscellaneous | Newton Excel Bach, not (just) an Excel Blog