How to manipulate time server?

Shell Programming and Scripting
1

hello, i want to know is that possible to manipulate time server.

if i use sh and execute

date1=`date +%Y%m%d%H%M`
echo $date1

and then the result is 201706081109
YearMonthDayHourMinutes

i need to change the minutes +1 or -1
example, the real time of the system is 201706081109

but i want the result to be 201706081110 or 201706081108 without change time of system.

Let me know if it possible

Thank you

2

With GNU date you can do :

date +%Y%m%d%H%M --date='-1 minute'

or

date +%Y%m%d%H%M --date='+1 minute'