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luatz/timetable: Optimize and export `is_leap`; add tests
[etc/awesome.git] / doc / timetable.md
1 # `luatz.timetable`
2
3 Provides an class to represent a time and date.
4 Objects have no concept of timezone or utc offset.
5
6 The fields are intentionally compatible with the lua standard library's `os.date` and `os.time`. Objects have fields:
7
8   - `year`
9   - `month`
10   - `day`
11   - `hour`
12   - `min`
13   - `sec`
14   - `yday` (optional)
15   - `wday` (optional)
16   
17 timetable components may be outside of their standard range (e.g. a month component of 
18 14) to faciliate arithmetic operations on date components. `:normalise ( )` can be 
19 called to modify components to return to their standard range.
20
21 Equality and comparisons should work between timetable objects.
22
23
24 ## `new ( year , month , day , hour , min , sec , [yday] , [wday] )`
25
26 Returns a new timetable with the given contents.
27
28
29 ## `new_from_timestamp ( timestamp )`
30
31 Returns a new timetable given a timestamp in seconds since the unix epoch of 
32 1970-01-01.
33
34 `:normalise ( )` should probably be called before use to resolve to the current time and 
35 date.
36
37
38 ## `:clone ( )`
39
40 Returns a new independant instance of an existing timetable object.
41
42
43 ## `:normalise ( )`
44
45 Mutates the current object's time and date components so that they lie within 'normal' 
46 ranges e.g. `month` is `1`-`12`; `min` is `0`-`59`
47
48
49 ## `:rfc_3339 ( )` and `__tostring` metamethod
50
51 Returns the timetable formatted as an rfc-3339 style string.
52 The timezone offset (or Z) is not appended.
53 The ranges of components are not checked, and if you want a valid timestamp, `:normalise 
54 ( )` should be called first.
55
56
57 ## `:timestamp ( )`
58
59 Returns the timetable as the number of seconds since unix epoch (1970-01-01) as a lua 
60 number.
61
62
63 ## `:unpack ( )`
64
65 Unpacks the timetable object; returns `year`, `month`, `day`, `hour`, `min`, `sec`, `yday`, `wday`