A sign of the times
Definition 1 of 1
Pro Tip 1/3Societal Changes
Used to comment on new trends that reflect current social or cultural shifts. 
Working from home has become a sign of the times.
Pro Tip 2/3Not Always Positive
Can refer to both positive and negative trends; context reveals the speaker's attitude. 
The need for food banks is a disturbing sign of the times.
Pro Tip 3/3Emotional Resonance
Evokes emotions or nostalgia; often implies a longing for past norms or practices. 
The closure of old bookshops is a sad sign of the times.