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document builtins.currentTime
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@ -17,3 +17,26 @@ These constants are built into the Nix language evaluator:
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The built-in value `currentSystem` evaluates to the Nix platform
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identifier for the Nix installation on which the expression is being
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evaluated, such as `"i686-linux"` or `"x86_64-darwin"`.
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- [`builtins.currentTime`]{#builtins-currentTime} (integer)
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Return the [Unix time](https://en.wikipedia.org/wiki/Unix_time) at first evaluation.
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Repeated references to that name will re-use the initially obtained value.
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Example:
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```console
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$ nix repl
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Welcome to Nix 2.15.1 Type :? for help.
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nix-repl> builtins.currentTime
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1683705525
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nix-repl> builtins.currentTime
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1683705525
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```
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> **Warning**
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>
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> This is intended for testing and debugging only.
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> Do not use it in production systems, since an impure, that is, non-constant value will break reproducibility.
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