AddMonthsYM | R Documentation |

The representation of year and month information in YYYYYMM format as an integer is sometimes a useful and efficient data structure. Adding a number of months to such a date is not quite catchy, however, since the date structure is to be retained. For example, 201201 - 2 [months] is expected to result in 201111 instead of 201199. AddMonthsYM does this job.

```
AddMonthsYM(x, n)
```

`x` |
a vector of integers, representing the dates in the format YYYYMM, to which a number of months has to be added. |

`n` |
the number of months to be added. If n is negative the months will be subtracted. |

All parameters will be recyled if necessary. The therefore used function `mapply`

will display a warning, if the longer argument is not a multiple of the length of the shorter one.

a vector of class `integer`

with the same dimension as x, containing the transformed dates.

Andri Signorell <andri@signorell.net>, based on code by Roland Rapold

`AddMonths`

; Date functions, like `Year`

, `Month`

, etc.

```
AddMonthsYM(201511, 5)
AddMonthsYM(c(201511, 201302), c(5, 15))
AddMonthsYM(c(201511, 201302), c(5, -4))
```

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