A series of statements, raise your arm when you think it's true!🙋🙋🏾‍♂️🙋🏻‍♀️🙋🏿‍♀️🙋‍♂️

each day has *24 hours*

each day is *23, 24 or 25 hours*

every time exists *only once* during a day

February has *28 or 29* days

every year is *365* days

every year is *365 or 366* days

everybody understands what *4/11 means*

everybody understands what *PI day* is

GMT is UTC

timezones are *whole hour* offsets from UTC

timezones are *half hour* offsets from UTC

jump *to DST* is around March

the difference between standard and DST is *an hour*

DST is always *ahead* of standard time

each country has *one* timezone

China spans *5 geographical* timezones

DST rules stay always the *same*

DST rules are announced *at least a year* in advance

DST rules are announced *in advance*

PST is *Pacific Standard Time*

a timezone identifier is the capital of a region

date calculations are easy

"2018-03-31" plus one month is "2018-04-31"

"2018-03-31" plus one month is "2018-04-30"