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add examples for 'current time point for N days ago or after N days'

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Bonnie I-Man Ng 2023-03-11 16:21:26 +00:00
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@ -1145,19 +1145,27 @@ date --date @1615852800
```
##### Print current time point for N days ago or after N days
##### Print current time point for N days ago or N days after
```bash
# get this time a day ago
# print current date first (for the following example)
date +"%F %H:%M:%S"
# 2023-03-11 16:17:09
# print the time that is 1 day ago
date -d"1 day ago" +"%F %H:%M:%S"
# 2023-03-10 16:17:09
# get this time tomorrow
date -d"-1 day ago" +"%F %H:%M:%S"
# get this time 7 days ago
# print the time that is 7 days ago
date -d"7 days ago" +"%F %H:%M:%S"
# 2023-03-04 16:17:09
# get this time a week ago
# print the time that is a week ago
date -d"1 week ago" +"%F %H:%M:%S"
# 2023-03-04 16:17:09
# add 1 day to date
date -d"-1 day ago" +"%F %H:%M:%S"
# 2023-03-12 16:17:09
```
##### wait for random duration (e.g. sleep 1-5 second, like adding a jitter)