std.algorithm can not be used inside pure functions?

[Szabo Bogdan via Digitalmars-d-learn]

On Saturday, 6 May 2017 at 15:01:16 UTC, Adam D. Ruppe wrote:
> On Saturday, 6 May 2017 at 14:14:41 UTC, Szabo Bogdan wrote:
>> oh yes, I get it... begin and end are `SysTime`.. there is any 
>> workaround for this?
>
> Don't use pure?
>
> I don't think any of the SysTime conversion methods are pure 
> since all of them call C functions which pull from the time 
> zone... even if you subclassed the timezone to be pure, SysTime 
> wouldn't pick that up since it uses the impure interface.
>
> I guess you could use a casted wrapper to hack in pure too, but 
> I'd say just take the keyword off.

Thanks!