Get months / years between two dates.

[bauss]

On Thursday, 7 May 2020 at 11:40:36 UTC, WebFreak001 wrote:
> On Wednesday, 6 May 2020 at 19:51:01 UTC, bauss wrote:
>> How do you exactly do that?
>>
>> Like if I have two dates as std.datetime.DateTime
>>
>> How will I get the months or years between the two dates?
>>
>> I was surprised to learn that Duration does not support them 
>> and only has weeks, days etc. but not months or years.
>>
>> I can't seem to find any standard way of doing it.
>>
>> Will I have to calculate that myself or? I feel like that's a 
>> big thing missing if it's not there already.
>>
>> My use-case is simple. I need to calculate years/months since 
>> a specific date has happened.
>
> A month doesn't have a specific amount days/weeks so "what is a 
> month" cannot be answered from just the duration alone. You can 
> use SysTime.diffMonths or DateTime.diffMonths to calculate the 
> number of months between two dates. Years are always 12 months 
> so you don't have to worry there and can just divide by 12
>
> If you also want days or weeks, you will need to calculate that 
> yourself afterwards

Yah if you saw my second reply that's what I said I found.

It did exactly what I needed it for.

What I was hoping for originally was that the duration had some 
"date" knowledge but that was just me being optimistic but as 
diffMonths solves the problem then there is no issue.