hardForkDate

Given a predicate that represents a relationship or action between entities, generate a one-sentence description explaining its meaning.  
# Instructions
Focus on describing the relationship, not the entities themselves. 
# Response Format
Begin the description with \' Indicates...\'

Predicate: hardForkDate

Indicates the date on which a protocol or system undergoes a hard fork, i.e., a non-backward-compatible change that splits or upgrades the network.