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FEATURE_SUMMARY.md

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🎉 JCRON v4.2.0 - New Functions & Hour Support

Summary

Added comprehensive support for:

  1. ⏰ Hour-based modifiers (E2H, S3H, EH, SH)
  2. ⏪ Previous time wrappers (prev_end, prev_start)
  3. ⏱️ Duration calculation (get_duration)

What's New

1. Hour Support (E/S + H)

  • E<n>H - End of N hours
  • S<n>H - Start of N hours
  • EH / SH - Shortcuts for 1 hour

2. New Functions (8 total)

-- Next time wrappers
jcron.next_end(pattern)
jcron.next_end_from(pattern, from_time)
jcron.next_start(pattern)
jcron.next_start_from(pattern, from_time)

-- Previous time wrappers
jcron.prev_end(pattern)
jcron.prev_end_from(pattern, from_time)
jcron.prev_start(pattern)
jcron.prev_start_from(pattern, from_time)

-- Duration calculation
jcron.get_duration(pattern, from_time)

3. Enhanced prev_time()

  • Added get_endof and get_startof parameters
  • Now consistent with next_time() API
  • Full modifier support

Quick Examples

-- Hour-based
SELECT jcron.next_time('E2H', NOW());  -- End of 2 hours
SELECT jcron.next_time('SH', NOW());   -- Start of next hour

-- Wrappers
SELECT jcron.next_end('0 0 9 * * *');  -- Next 9 AM end
SELECT jcron.prev_start('E1W');         -- Previous week start

-- Duration
SELECT jcron.get_duration('0 0 9 * * * E1D', NOW());  -- Day period

Test Results ✅

All tests passing (100%):

  • ✅ E2H/S3H hour calculations
  • ✅ EH/SH shortcuts
  • ✅ next_end/start wrappers
  • ✅ prev_end/start wrappers
  • ✅ get_duration with/without modifiers

Performance: All operations < 3ms

Files Modified

Core:

  • sql-ports/jcron.sql - All function implementations

Documentation:

  • CHANGELOG_NEW_FUNCTIONS.md - Detailed changelog
  • FEATURE_SUMMARY.md - This file

To Update:

  • sql-ports/SYNTAX.md - Add H examples
  • sql-ports/API.md - Add new functions
  • sql-ports/README.md - Update features

Breaking Changes

None - All changes are additive and backward compatible.

Next Steps

  1. Update SYNTAX.md with H modifier examples
  2. Update API.md with new function docs
  3. Update README.md feature list
  4. Create test suite for new functions

Version: 4.2.0
Date: October 9, 2025
Status: ✅ Complete & Tested
⚡