When you are specifying a time in this format, it is This is the number of seconds since January first,ġ970, midnight, UTC. Internally, RRDtool uses "seconds since the epoch" The previous paragraph is very important. There is no time 02:00 to 02:59 in the first case. This also means that on those days local time is not what you expect. In UTC! It is the offset that is altered, not time itself!
Changing back to normal time means a day of 25 hours. Is 23 hours (In our time zone, at 01:00 UTC the clock is set forward an If it is 13:00 UTC, it isĬhanging from normal local time to summer time means that a whole day We are east of Greenwich so we areĪhead of UTC time by either one or two hours. AnĮxample works best: in the Netherlands we have a time offset of one hour, Most, not all, places use an offset that is a whole amount of hours.ĭuring summer time, another hour is added (again: not everywhere). Try one or some, to roughly know your offset. There are several converters to be found on the internet that can convert It's easy to remember: the sun rises in the east, day starts in Locations east of Greenwich have a local time that is ahead Locations west of Greenwich (England, not USA) have a local time that RRDtool will convert local time into time, or back, when necessary. This isĬalled "summer time" or "daylight saving". (explained next) and apply another offset during the summer. Most places on earth apply some offset to get "local time" Anyway, now the world had one time to work with,Įverywhere on the world it was the same time. Why "UTC" was chosen over "UCT", "CTU" or Like "TUC", the French didn't like "CUT", I don't know Local Time aka Wall Clock timeĪs of 1970 (or so) UTC was invented. Most of you will find the information presented here more than enough. Will do a good job, amongst others that I didn't verify. Please look this up elsewhere if you want to know details wikipedia It may be 12:00 for both, but then it's going to be 12:00amįor one and 12:00pm for the other. People on opposite sides of the globe will disagree on being day Time depends (mostly) on the position of the sun in the
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