Let us count the days

[oshfdk]

Ah, I see. So "otaram" is a strange one, it appears as "otar am", I'm not super sure what function the space serves so I pass on that one. More generally the "m" character appears to be a special case based on its positioning at the end of a word. Which is all a long way of saying "I don't know and I'd need to spend more time puzzling out the many, many remainders behind this idea".

It is not specific to -m, if it was otaran and otalan the problem would remain.

In general, as far as I can see, the counting validates your idea only if the 8 labels between otalal and otaral are sequential days. If they are not sequential days, then there could be any number of them and there is no special meaning to there being exactly 8 labels.

Which means otaram (or otar,am) should be 364 and otalam should be 357. Also, there is okaram at the position where the number should be 359.

It's quite possible that you are onto something, but to me it looks like it's not as simple as adding adjacent character values, if the sequence is supposed to represent sequential numbers.