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Date: Fri, 4 Sep 2020 07:39:07 +0200 (CEST)
From: Dietmar Maurer <dietmar@proxmox.com>
To: Proxmox Backup Server development discussion <pbs-devel@lists.proxmox.com>, 
 Dominik Csapak <d.csapak@proxmox.com>
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Subject: Re: [pbs-devel] [PATCH proxmox-backup 07/10] tools/systemd/time:
 use i32 for DateTimeValues instead of u32
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>  #[derive(Debug)]
>  pub enum DateTimeValue {
> -    Single(u32),
> -    Range(u32, u32),
> -    Repeated(u32, u32),
> +    Single(i32),
> +    Range(i32, i32),
> +    Repeated(i32, i32),

Even the repetition value is now signed. I cannot see why that makes sense? 
You want to repeat backwards in time?