Timestring Converter

[tbackus127]

Both RelativeTimeConfiguration and AbsoluteTimeConfiguration need getNextEpochSecond() implemented to convert a time config string into a number.

• [x] Absolute Tests
• [x] Absolute Configs: Basic on/at parsing
• [x] Absolute Configs: Lists
• [x] Absolute Configs: Wildcards
• [x] Relative Tests
• [ ] Relative Configs

Examples (relative):

• "2h" -> +7200 seconds
• "2h10m -> +7800 seconds
• "1M3d" -> +2678400 seconds
• "7M2w14d3h22m" -> +20575340 seconds

Examples (absolute):

• "on Feb 14 2019" -> 1550142000 seconds
• "at 15:00" -> Today's first epoch second + 54000 seconds
• "on [Jan,Jun] [1,15]" -> If today is 3/4, Jun 1st's epoch second. If 6/14, Jun 15th's epoch second.
• "on 1 " -> Every 1st of the month.
• "on Dec [21,22,23,24] * at 17:00" -> Every day at 5PM on December 21st-24th.

Time conversions (with label):

• 1 minute (m)
• 1 hour (h): 60 minutes
• 1 day (d): 24 hours
• 1 week (w): 7 days
• 1 month (M): 30 days