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{% comment %}
argv: datestring
return: day in week (1: monday)
{% endcomment %}
{% assign dayinweek_datearr = argv[0] | split: " " %}
{% assign dayinweek_datearr = dayinweek_datearr | split: "-" %}
{% assign dayinweek_magic = "032503514624" | split: "" %}
{% assign dayinweek_mesec = dayinweek_datearr[1] | plus: 0 %}
{% assign dayinweek_day = dayinweek_datearr[2] | plus: 0 %}
{% assign dayinweek_magicselector = dayinweek_mesec | minus: 1 %}
{% if dayinweek_mesec < 3 %}
{% assign dayofweek_leto = argv[0] | minus: 1 %}
{% else %}
{% assign dayofweek_leto = argv[0] | plus: 0 %}
{% endif %}
{% assign return = dayofweek_leto | divided_by: 4 | plus: dayofweek_leto | plus: dayinweek_day | plus: dayinweek_magic[dayinweek_magicselector] %}
{% assign dayofweek_leto_div = dayofweek_leto | divided_by: 100 %}
{% assign return = return | minus: dayofweek_leto_div %}
{% assign dayofweek_leto_div = dayofweek_leto | divided_by: 400 %}
{% assign return = return | plus: dayofweek_leto_div %}
{% assign return = return | modulo: 7 %}
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