Films do it because they have to |
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Hmmm, I'm not sure that's strictly true. Demonstrating the passage of time is one of the key skills of good film-making and it's generally considered a 'cop-out' to use an on-screen display. Apart from anything else, such displays destroy any chance of suspension of disbelief since you're instantly and firmly reminded that you're viewing a film.
I'd imagine much of the same 'rules' and techniques used by film-makers could be applied to books. Some of the more obvious tricks used in film are to open with a shot of a clock, or of trees in autumn (when the previous scene was clearly summer). Sometimes the plot of the film itself can offer a good marker - for example if the plot involves a derelict house being rebuilt then an obvious clue to time passage is to show it completed.
A single year presents something of a quandry because it's too long a period for the 'shorter' tricks and yet not long enough for the more long term devices. Also, being a whole year rules out most of the seasonal clues. However, depending on the exact timings involved you may be able to use certain regular events. For example:
"As he stumbled into the street, Carter couldn't believe that already Christmas lights were again being strung along the street."
There are several other events you could use; the start/end of the football/cricket season, school holidays, British Summer Time: -
"Leaning forward to slide the clock back onto it's peg, an hour of his life taken, the walls were suddenly splashed with Jane's blood. Summer Time had started again, but in a year the memories had never stopped."
or something well written
There are personal clues as well, of course. Has the MC lost or gained weight? Has he now grown a beard or his hair? Is he
losing his hair? Maybe he has a new car and he can complain about how it's done nothing but break down since he bought it after finding his grandfather's hidden Nazi gold?
Sometimes (and I'm struggling to think of a good example from a published work) it's only necessary to make it clear that time has passed by the
style of the writing and how the character behaves. Someone that's been brought to his knees by illness or events can be shown to be behaving in a manner that suggests substantial time has passed. A serious injury can be healed but still aching, a traumatic event now uneasy memories and so on.
Hope this helps some and isn't rubbish.
Jon