Linux date acquisition time is accurate to milliseconds

Order:

• date +‘%F %T.%3N’

%F is equivalent to %Y%m%d,
%T is equivalent to %H%M%S,
%3N means milliseconds take 3 digits.
There are spaces in the middle, so add single quotes.

# 带毫秒 2023-02-02 08:17:18.671
echo "时间是：`date +'%F %T.%3N'`"
# 不带毫秒 2023-02-02 08:17:23
echo "时间是：`date '+%Y-%m-%d %H:%M:%S'`"