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custom_date_parsing

📅 Custom Date Parsing with Fractional Seconds​

Ruby’s built‑in parsers may drop subsecond precision. Use DateTime.strptime with %L or %Q to capture milliseconds and microseconds explicitly. This ensures you don’t lose critical timing data.

require 'date'

# Parse ISO8601 with milliseconds
dt = DateTime.strptime('2022-03-13T15:45:30.123Z', '%Y-%m-%dT%H:%M:%S.%L%Z')
puts dt.strftime('%Y-%m-%d %H:%M:%S.%L %Z')
# => "2022-03-13 15:45:30.123 UTC"

# Parse with microseconds (Ruby 2.7+)
dt2 = DateTime.strptime('2022-03-13T15:45:30.123456Z', '%Y-%m-%dT%H:%M:%S.%6N%Z')
puts dt2.strftime('%Y-%m-%d %H:%M:%S.%6N %Z')