linux time format command

Here am stacked with a small problem. I need to know the exact command to get the time 开发者_开发问答in following format:-86400000. But problem is from the system am getting the format like:-24:00:00.

please give me the exact command

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If I understand your desired output correctly (seconds since the epoch), you can use:

date +%s

See man date for the explanation of the different formats available if this isn't right.

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(Technically, the answer to your question is to run date +-86400000 which will format the time exactly as you asked for. You really should improve the question...)

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As addition to Andrzejs answer:

for a shorter overview:

date --help

for a more verbose one:

info coreutils date invocation