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jdrews/age-of-install-datediff.sh

Created November 8, 2025 01:44
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calculate the age of a system using datediff
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age-of-install-datediff.sh
#!/bin/bash
INSTALL_DATE=$(stat -c %w /)
NOW_DATE=$(date "+%Y-%m-%d %H:%M:%S")
echo "System installed at $INSTALL_DATE"
# Format 1: days, hours, minutes, seconds
DAYS_DIFF=$(datediff -f "%d days, %H hours, %M minutes, %S seconds" "$INSTALL_DATE" "$NOW_DATE")
echo "Days since installation: $DAYS_DIFF"
# Format 2: years, months, days, hours, minutes, seconds
FULL_DIFF=$(datediff -f "%y years, %m months, %d days, %H hours, %M minutes, %S seconds" "$INSTALL_DATE" "$NOW_DATE")
echo "Years/Months since installation: $FULL_DIFF"
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