Add datetime helpers and move all time/date time datetime_handling folder

previous string_handling located datetime and timestamp files have been moved
to the datetime handling folder

Update readme file with more information about currently covered areas

test-run/string_handling/datetime_helpers.py

@@ -1,26 +0,0 @@
-#!/usr/bin/env python3
-
-"""
-date string helper test
-"""
-
-from corelibs.string_handling.datetime_helpers import get_datetime_iso8601
-
-
-def main() -> None:
-    """
-    Comment
-    """
-    print(get_datetime_iso8601())
-    print(get_datetime_iso8601('Asia/Tokyo'))
-    print(get_datetime_iso8601('UTC'))
-    print(get_datetime_iso8601('Europe/Vienna'))
-    print(get_datetime_iso8601('America/New_York'))
-    print(get_datetime_iso8601('Australia/Sydney'))
-    print(get_datetime_iso8601('invalid'))
-
-
-if __name__ == "__main__":
-    main()
-
-# __END__

test-run/string_handling/timestamp_strings.py

@@ -1,88 +0,0 @@
-#!/usr/bin/env python3
-
-"""
-timestamp string checks
-"""
-
-from corelibs.string_handling.timestamp_strings import (
-    seconds_to_string, convert_to_seconds, TimeParseError, TimeUnitError
-)
-
-
-def main() -> None:
-    """
-    Comment
-    """
-    test_cases = [
-        "5M 6d",           # 5 months, 6 days
-        "2h 30m 45s",      # 2 hours, 30 minutes, 45 seconds
-        "1Y 2M 3d",        # 1 year, 2 months, 3 days
-        "1h",              # 1 hour
-        "30m",             # 30 minutes
-        "2 hours 15 minutes",  # 2 hours, 15 minutes
-        "1d 12h",          # 1 day, 12 hours
-        "3M 2d 4h",        # 3 months, 2 days, 4 hours
-        "45s",             # 45 seconds
-        "-45s",            # -45 seconds
-        "-1h",             # -1 hour
-        "-30m",            # -30 minutes
-        "-2h 30m 45s",     # -2 hours, 30 minutes, 45 seconds
-        "-1d 12h",         # -1 day, 12 hours
-        "-3M 2d 4h",       # -3 months, 2 days, 4 hours
-        "-1Y 2M 3d",       # -1 year, 2 months, 3 days
-        "-2 hours 15 minutes",  # -2 hours, 15 minutes
-        "-1 year 2 months",  # -1 year, 2 months
-        "-2Y 6M 15d 8h 30m 45s",  # Complex negative example
-        "1 year 2 months",  # 1 year, 2 months
-        "2Y 6M 15d 8h 30m 45s",  # Complex example
-        # invalid tests
-        "5M 6d 2M",        # months appears twice
-        "2h 30m 45s 1h",   # hours appears twice
-        "1d 2 days",       # days appears twice (short and long form)
-        "30m 45 minutes",  # minutes appears twice
-        "1Y 2 years",      # years appears twice
-        "1x 2 yrs",        # invalid names
-
-        123,               # int
-        789.12,            # float
-        456.56,            # float, high
-        "4566",            # int as string
-        "5551.12",         # float as string
-        "5551.56",         # float, high as string
-    ]
-
-    for time_string in test_cases:
-        try:
-            result = convert_to_seconds(time_string)
-            print(f"Human readable to seconds: {time_string} => {result}")
-        except (TimeParseError, TimeUnitError) as e:
-            print(f"Error encountered for {time_string}: {type(e).__name__}: {e}")
-
-    test_values = [
-        'as is string',
-        -172800.001234,  # -2 days, -0.001234 seconds
-        -90061.789,      # -1 day, -1 hour, -1 minute, -1.789 seconds
-        -3661.456,       # -1 hour, -1 minute, -1.456 seconds
-        -65.123,         # -1 minute, -5.123 seconds
-        -1.5,            # -1.5 seconds
-        -0.001,          # -1 millisecond
-        -0.000001,       # -1 microsecond
-        0,               # 0 seconds
-        0.000001,        # 1 microsecond
-        0.001,           # 1 millisecond
-        1.5,             # 1.5 seconds
-        65.123,          # 1 minute, 5.123 seconds
-        3661.456,        # 1 hour, 1 minute, 1.456 seconds
-        90061.789,       # 1 day, 1 hour, 1 minute, 1.789 seconds
-        172800.001234    # 2 days, 0.001234 seconds
-    ]
-
-    for time_value in test_values:
-        result = seconds_to_string(time_value, show_microseconds=True)
-        print(f"Seconds to human readable: {time_value} => {result}")
-
-
-if __name__ == "__main__":
-    main()
-
-# __END__