>>2816442When you see such text that you fail to understand because it's typed entirely in kana (particularly useful for half-width katakana cases), try retyping it in Google Translate with the source language set to Japanese and the romaji input enabled, then hitting the space button to let it figure out a convenient spelling for you (though beware of せいが, which should be 静画, the image posting section of the website).
It's the posting date (toukou) of the original video (honke), which in this case refers to the posting date of sm18802511 per Japanese Standard Time, which may not match the date & time shown to you in the browser if your time zone deviates from Japan. (It seems to be based on your system clock if you are not logged in, might be affected by account TZ settings.) Unrelated to this particular case, but you can also use it to quickly type full-width numbers. Sometimes they don't specify that part.
>>2816429"Still image number followed by ﾎﾊﾞﾘﾝｸﾞ converted to hiragana."
"Same, but 藤の花 instead."
"Same, but 藤."
