How to convert UTC Date Time String to Java object and compare it ?

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Use java.time.Instant;

import java.time.Instant;

Instant instantStart = Instant.parse("20200229T12:00:00Z");
Instant instantEnd = Instant.parse("20200329T12:00:00Z");
Instant instantNow = Instant.now();

return instantNow.isAfter(instantStart) &&  
       instantNow.isBefore(instantEnd);

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