Here’s a handy little script that has multiple applications to calculate date from a year ago.
#!/bin/bash now=$(date +%Y%m%d-%H%M%S) # mac os year_old=$(date -v-1y +%Y%m%d-%H%M%S) # linux os year_old=$(date -d "-1 year" +%Y%m%d-%H%M%S) echo $now echo $year_old |
Mac Os and Linux has slightly different formats. Pick one based on your OS.
Results
20230618-084940 20220618-084940 |