How to Modify a Global Date Variable

Question

Is it possible to modify a date variable (entry_date in this case) so that you have entry_date plus one year (or any other amount of time)?

For example, if entry_date was 6/4/14 2:59 PM, could I add one year to that date and end up with 6/4/15 2:59 PM, and would I still be able to use that variable in a conditional statement?

EDIT: Essentially what I want is something like this:

{if (entry_date + one_year) > current_time}
    <p>New Product</p>
{/if}

SECOND EDIT:

Robson, I tried the code that you added (both the regular and inverted logic) and I'm unfortunately STILL ending up with the same error. However, I continued to play around with the code and found that this does not throw an error:

{if {current_time format="%Y%m%d%H%i"} == {entry_date format="%Y%m%d%H%i"}}
    less than an year
{if:else}
    more than an year
{/if}

But this does throw the same error:

{if {current_time format="%Y%m%d%H%i"} - {entry_date format="%Y%m%d%H%i"} == 1}
    less than an year
{if:else}
    more than an year
{/if}

Do I need to change the comparative number to something more specific? Are we comparing two variables that we can't compare? Or am I just missing some bracket again? I feel like it's almost there...

Answer 1

I never tried something like this, but maybe it could work.

You can't add a year to a date without an add-on., but there are mathematical operators on the conditionals.

Format the date like a number using all data required by the precision you need plus one year following the same format: YYYYMMDDHHMM.

{if {entry_date format="%Y%m%d%H%i"} + 100000000 > {current_time format="%Y%m%d%H%i"} }
    less than an year
{if:else}
    more than an year
{/if}

Maybe it's better to invert the logic to make the code easier to understand:

{if {current_time format="%Y%m%d%H%i"} - {entry_date format="%Y%m%d%H%i"} < 100000000  }
    less than an year
{if:else}
    more than an year
{/if}

---

Using an add-on

If you can't update to EECMS 2.9 you can code your own add-on for this using strtotime() php function, like Low Nice Date does.

{exp:low_nice_date date="{entry_date format='%Y-%m-%d %H:%i + 1 Year'}" format="%Y%m%d%H%i"}

But the code will become far more complex and harder to maintain.