These functions calculate the date (or more specifically, the value of the index of a zoo object) of an extreme value for a zoo series.

1 2 3 4 5 | ```
which.min.zoo(x)
which.max.zoo(x)
which.range.zoo(x)
``` |

`x` |
a zoo object |

the value of the index for the min, max, or range

1 2 3 4 | ```
x <- zoo(1:10)
which.min.zoo(x)
which.max.zoo(x)
which.range.zoo(x)
``` |

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