# when assume_tz "GMT" when assume_tz NA
# --------------------------- ---------------------------
# raw possibly definitely raw possibly definitely
# ----- --------- ---------- ----- --------- -----------
# 1998 < 1999 TRUE TRUE TRUE NA TRUE FALSE
# 1998 < 1997 FALSE FALSE FALSE NA TRUE FALSE
# 1999 < 1999 NA TRUE FALSE NA TRUE FALSE
# 1998 < 1999/1/3 TRUE TRUE TRUE TRUE TRUE TRUE
parttime(1998) < parttime(1999)
parttime(1998) < parttime(1997)
parttime(1999) < parttime(1999)
parttime(1998) < parttime(1999, 1, 3)
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