When should I use “since that day” and when “from that day on”?
“from that day on” has an open-ended end-point, whereas “since that day” specifically means up until the present. When talking about ongoing affairs, “open-ended” usually implies “up until the present”, so there is little difference except that “from that day on” perhaps has more of a “story-telling” feel. When talking about historical events, however, “since” may be inappropriate. For example, if you said of someone whole who lived 100 years ago that “from that day on, he never touched a drop of alcohol”, then the end-point is assumed to be the time of his death. In that case “since that day” would be inappropriate.
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