Conditionals using current time format

Question

does anyone know why this code will not display correctly? It looks right to me.

{if "{current_time format='%d.%m'}" >= "06.11" && "{current_time format='%d.%m'}" <= "07.01"}
6 Jan

{if:elseif "{current_time format='%d.%m'}" >= "06.01" && "{current_time format='%d.%m'}" <= "21.02"}
20 Feb

{if:elseif "{current_time format='%d.%m'}" >= "20.02" && "{current_time format='%d.%m'}" <= "28.03"}
27 Mar

{if:elseif "{current_time format='%d.%m'}" >= "27.03" && "{current_time format='%d.%m'}" <= "16.05"}
15 May

{if:elseif "{current_time format='%d.%m'}" >= "15.05" && "{current_time format='%d.%m'}" <= "04.08"}
3 Aug

{if:elseif "{current_time format='%d.%m'}" >= "03.08" && "{current_time format='%d.%m'}" <= "12.09"}
11 Sept

{if:elseif "{current_time format='%d.%m'}" >= "11.09" && "{current_time format='%d.%m'}" <= "07.11"}
6 Nov
{/if}

Answer 1

You are comparing numbers. {current_time format='%d.%m'} is outputted as 18.08. This number is bigger than 06.01 and smaller than 21.02. Therefor it is correct that the text 20 Feb is printed.

Use epoch dates to compare. It is a reliable solution.

Edit: The plugin Str To Time seems to have what you want. Use it to convert the date you want to compare to, to a timestamp. Something like this:

{if {current_time} >= {exp:str_to_time date="November 6th, {current_time format='%Y'}"} && 
    {current_time} <= {exp:str_to_time date="January 7th, {current_time format='%Y'}"}}
    6 Jan
{if:elseif {current_time} >= {exp:str_to_time date="August 3th, {current_time format='%Y'}"} && 
    {current_time} <= {exp:str_to_time date="September 9th, {current_time format='%Y'}"}}
11 Sept
{if:else}
No date available
{/if}