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Updated Examples and Recipes (markdown)

Howard Hinnant
2016-05-21 11:27:36 -04:00
parent d6a46d9afc
commit cae3ae8f35
1 changed files with 4 additions and 3 deletions
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Examples-and-Recipes.md

@@ -320,15 +320,16 @@ This example demonstrates both some simple date arithmetic, and how to handle di
using namespace date;
// Dave was born April 24, 1954. 10:03 AM pst
// Want to know when he is 2 Gigaseconds old
auto birthday = make_zoned("America/Los_Angeles", local_days{apr/24/1954} + 10h + 3min);
std::cout << "born : " << birthday << '\n';
auto birthday = make_zoned("America/Los_Angeles",
local_days{apr/24/1954} + 10h + 3min);
std::cout << "born : " << birthday << '\n';
birthday = birthday.get_sys_time() + 2'000'000'000s;
std::cout << "2Gs birthday: " << birthday << '\n';
}
One first creates the local time, and then pairs that to the time zone "America/Los_Angeles" using `make_zoned`. Then add 2Gs to the `sys_time` (not the `local_time`) of `birthday`. This outputs:
born : 1954-04-24 10:03:00 PST
born : 1954-04-24 10:03:00 PST
2Gs birthday: 2017-09-08 14:36:20 PDT
Note that without handling the timezone correctly, this result would be an hour off (2017-09-08 13:36:20) because the birth date falls in PST, and the celebration date falls in PDT.