calculateRetentionDate static method
Calculates retention days between installDayUtc (yyyyMMdd) and nowUtcMillis.
Implementation
static int calculateRetentionDate(int installDayUtc, int nowUtcMillis) {
if (installDayUtc == -1) return -1;
try {
final year = installDayUtc ~/ 10000;
final month = (installDayUtc % 10000) ~/ 100;
final day = installDayUtc % 100;
final installDate = DateTime.utc(year, month, day);
final diffMillis = nowUtcMillis - installDate.millisecondsSinceEpoch;
final diffDays = diffMillis ~/ (1000 * 60 * 60 * 24);
return diffDays;
} catch (_) {
return -1;
}
}