math
A calendar shows that after Monday, Tuesday, Wednesday, Thursday, Friday, and Saturday come and go, one day is left before the week starts over.
Sunday is correct — it's the seventh and last day of the week, coming after Monday through Saturday, and once it's over, the calendar starts the whole week again with Monday.
'Someday' and 'payday' aren't real days of the week at all — they're just playful-sounding words, not part of the actual weekly calendar.
Different countries actually arrange their calendars a little differently — some consider Sunday the first day of the week instead of the last, even though the same seven days always appear in the same order.
math
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