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Fixed Date + Time

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This commit is contained in:
Tim Zöller 2025-12-03 22:26:56 +01:00
parent c84697edc7
commit 32a12f25dc
1 changed files with 7 additions and 1 deletions
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8
src/main/java/org/operaton/fitpub/util/FitParser.java
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@ -282,10 +282,16 @@ public class FitParser {
/** /**
* Converts FIT DateTime to LocalDateTime. * Converts FIT DateTime to LocalDateTime.
* FIT timestamps use a special epoch: December 31, 1989, 00:00:00 UTC.
* We need to add the offset from Unix epoch (1970) to FIT epoch (1989).
*/ */
private LocalDateTime convertDateTime(DateTime dateTime) { private LocalDateTime convertDateTime(DateTime dateTime) {
// FIT epoch offset: seconds between 1970-01-01 and 1989-12-31
final long FIT_EPOCH_OFFSET = 631065600L;
long timestamp = dateTime.getTimestamp(); long timestamp = dateTime.getTimestamp();
Instant instant = Instant.ofEpochSecond(timestamp); // Add FIT epoch offset to convert to Unix timestamp
Instant instant = Instant.ofEpochSecond(timestamp + FIT_EPOCH_OFFSET);
return LocalDateTime.ofInstant(instant, ZoneId.systemDefault()); return LocalDateTime.ofInstant(instant, ZoneId.systemDefault());
} }