Overview
This article covers miscellaneous How-Tos for Joda-Time.
- Convert 2 Digit Year To 4 Digit Year Using Pivot Year
- Get List Of Default Time Zones
- Verify Whether A Partial DateTime Is Contiguous
Convert 2 Digit Year To 4 Digit Year Using Pivot Year
In Joda-Time, it is possible to convert 2 digit year to 4 digit year using the concept of ‘Pivot Year’.
The Pivot year defines the range of supported years using the following formula:
range = (pivot year – 50) to (pivot year + 49)
Hence if the pivot year is 1975, the supported range is 1925 to 2024.
To convert from 2 digit year to 4 digit year, the appropriate digits are prefixed to the 2 digit year from the supported range based on the pivot year.
e.g. If the pivot year is 1975, then
| 2 digit year | Corresponding 4 digit year |
|---|---|
| 00 | 2000 |
| 20 | 2020 |
| 40 | 1940 |
| 60 | 1960 |
| 80 | 1980 |
Get List Of Default Time Zones
Use
DateTimeUtils.getDefaultTimeZoneNames()
for fetching a list of default time zones.
Verify Whether A Partial DateTime Is Contiguous
A date can be defined as a partial. See
here
for further details.
The fields defined in a Partial DateTime can be contiguous (i.e. adjacent to each other) or non-contiguous (i.e. not adjacent to each other).
e.g. The fields year and month are contiguous. However the fields year and hour are not contiguous.
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