MikroTik RouterOS v2.9 Reference Manual page 598

If local time is before GMT time, time-zone value will be negative. For example, if GMT is
18:00:00, but correct local time is 15:00:00, time-zone has to be set to -3 hours:
[admin@MikroTik] system clock> set time-zone=-3
[admin@MikroTik] system clock> print
time: sep/24/2004 08:13:28
time-zone: -03:00
[admin@MikroTik] system clock>
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