Linux时间戳如何测试

? Linux ???,???????????????????????????????????:

1. ???????(??): ?? date ????????? Unix ???(?????)?

   date +%s
   

2. ???????(???): ????????????,????????:

   date +%s%3N
   

   ??

   date +%s | xargs -I {} echo "{}$(printf 'd' $(date +%N | cut -b1-3))"
   

3. ???????????: ????????????????????:

   date -d @  # ??  ??????????
   

4. ?????????: ???????????????????,???????????:

   #!/bin/bash
   
   # ?????????
   current_timestamp=$(date +%s)
   
   echo "Current timestamp (seconds): $current_timestamp"
   
   # ??????(??5?)
   sleep 5
   
   # ???????
   new_timestamp=$(date +%s)
   
   echo "New timestamp after 5 seconds: $new_timestamp"
   
   # ?????
   time_difference=$((new_timestamp - current_timestamp))
   echo "Time difference (seconds): $time_difference"
   

??????,??????? Linux ????????????