You might indicate time leaping by having the character experience d茅j脿 vu or strange memories that don't fit the current time. Or maybe they have a special device or power that causes the leap and it's mentioned explicitly.
A simple way could be having the narrator directly state that a time leap has occurred. Another option is to show the character waking up in a different time period with no explanation at first, leaving the reader to figure it out as the story progresses.
You could indicate a time gap by starting a new chapter or section with a date or time stamp. Or, describe how technology or fashion has evolved to imply the time that's gone by.
You can show a text message in a short story by describing the character's reaction to it or the words on the screen of their phone.
You can use transitional words or phrases like 'meanwhile', 'next', or 'suddenly' to show a change in section.
You can use clear markers like dates, seasons, or specific events. For example, 'It was the summer of 1985' or 'As the leaves turned gold in autumn'.
You could also mention specific dates or seasons. Saying 'It was Christmas Eve, and the snow was falling thickly.' gives a clear indication of the time of the year.
You can simply write it at the top of the first page, usually in a larger font or a different style to make it stand out.
You can use clear titles and concise summaries. Titles that give a hint of the main idea or a unique aspect of the story work well.
You can use asterisks or dashes to mark section breaks. Like '***' or '---'. It's a simple and effective way.
Takemichi's time - leaping ability in the Tokyo Revengers real story is quite unique. It doesn't seem to follow a set pattern like in some other time - travel stories. As I said before, emotions play a big role. But also, it's not something he can fully control. Sometimes it happens unexpectedly. For example, when he's in a dangerous situation and his mind is focused on going back to change things, he is suddenly transported back. This ability is what drives the whole plot as he uses it to try and make a better future for his friends and Hinata by changing the past.
Time of day is a common one. For instance, 'the sun was setting' tells the reader it's evening. It can set a mood too, like a sense of calm or impending doom.