It doesn't to me. It should be obvious that there are plenty of valid uses of dates and times which implicitly refer to either an exact instant in time, or the expression of a time in a certain reckoning.
A birthday doesn't have a time zone because the concept of a birthday is more about the date on the calendar on the wall, not any universally understood singular instant in time; and so what matters most when it comes to your birthday is where you are. Your birthday doesn't move to the day before or after just because you travel to the other side of the globe.
A deadline has a time zone because when your boss says he wants the project done by 4PM, he means 4PM wherever you both currently are -- and the specific instant in time he referred to doesn't change if you get on a train and move a time zone over before that 4PM occurs.
And it may in fact be time zone and not just UTC with an offset; because if your boss tells you he wants a certain report on his desk by 4PM every day; when your local time zone goes into daylight saving time, it doesn't suddenly mean the report needs to be filed by 5PM instead.
In the first of these cases, the date itself has no time zone and is valid in whatever context its being read from. In the second, the instant in time might be expressed in UTC time with or without a specific offset. In the third, each of the successive instants in time may shift around with respect to UTC even while it continues to be referred to with one constant expression.
None of these are subjective interpretations. They're a consequence of the fact that as humans we've overloaded our representation of date/time with multiple meanings.
idk about you but I can get a happy birthday on the hour of my actual birth from people in the know but I never literally prepare things for the exact hour of the deadline. It's more like a day sort of thing
It does not. I'm Australian and our timezones are ahead of the US (NSW time is about 15-17 hours ahead of US Eastern time). If I took a flight from Sydney to New York (22~ hours) on my birthday, the US custom's officer would wish me happy birthday when I landed the next day.
Therefore, birthdays are not bound by timezone at all.
It doesn't to me. It should be obvious that there are plenty of valid uses of dates and times which implicitly refer to either an exact instant in time, or the expression of a time in a certain reckoning.
A birthday doesn't have a time zone because the concept of a birthday is more about the date on the calendar on the wall, not any universally understood singular instant in time; and so what matters most when it comes to your birthday is where you are. Your birthday doesn't move to the day before or after just because you travel to the other side of the globe.
A deadline has a time zone because when your boss says he wants the project done by 4PM, he means 4PM wherever you both currently are -- and the specific instant in time he referred to doesn't change if you get on a train and move a time zone over before that 4PM occurs.
And it may in fact be time zone and not just UTC with an offset; because if your boss tells you he wants a certain report on his desk by 4PM every day; when your local time zone goes into daylight saving time, it doesn't suddenly mean the report needs to be filed by 5PM instead.
In the first of these cases, the date itself has no time zone and is valid in whatever context its being read from. In the second, the instant in time might be expressed in UTC time with or without a specific offset. In the third, each of the successive instants in time may shift around with respect to UTC even while it continues to be referred to with one constant expression.
None of these are subjective interpretations. They're a consequence of the fact that as humans we've overloaded our representation of date/time with multiple meanings.
idk about you but I can get a happy birthday on the hour of my actual birth from people in the know but I never literally prepare things for the exact hour of the deadline. It's more like a day sort of thing
It does not. I'm Australian and our timezones are ahead of the US (NSW time is about 15-17 hours ahead of US Eastern time). If I took a flight from Sydney to New York (22~ hours) on my birthday, the US custom's officer would wish me happy birthday when I landed the next day.
Therefore, birthdays are not bound by timezone at all.
it's a cool thing to wish happy birthday on the hour they were born (if you know it) but I can't say the same about preparing for deadline.
I don't get a happy birthday from customs though, cool!