`date +%s` gives now-as-epoch; `date -d @N` converts an epoch number back to a human date. Often what API responses expect / return.
Bash
# Current epoch
date +%s # 1735689600
# Epoch to human (UTC)
date -u -d @1735689600 +"%F %T UTC" # 2025-01-01 00:00:00 UTC
# Epoch to human (local TZ)
date -d @1735689600 # Tue Dec 31 18:00:00 CST 2024
# Human → epoch
date -d "2025-01-01 00:00:00 UTC" +%s # 1735689600
# Epoch in milliseconds (for JS timestamps)
echo $(( $(date +%s) * 1000 )) # 1735689600000
# Or with nanosecond precision
date +%s%N | cut -c1-13 # epoch ms via sliceSave your own code snippets
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