If conditional in email tempalte

Hi

I need to make conditions in the email template that goes to the administrator.

I have 2 custom fields, but I would like to print in the mail the value of one of them depending on what a user enters.

I have tried to make them with these 2 options and none of them have solved my problem:

Op. 1: {% if ufield_24="1970-01-01" %} {ufield_35} {% else %} {ufield_24} {% endif %}

Op. 2: {$ if ufield_24="1970-01-01" $} {ufield_35} {$ else $} {ufield_24} {$ endif $}

When making these conditions it is because if you send the empty date fields it sends the date as "1970-01-01".

Is there any other way to show the empty date field when the user does not type in any date field?

Or how can I make the IF conditions in the mail template?

I look forward to your comments

Regards